#33 Stripe Integration Guide for Next.js 15 with Supabase

This guide provides a step-by-step process to integrate Stripe payments into your Next.js 15 application with Supabase authentication. Prerequisites Before starting, ensure you have: A Next.js 15 application set up Supabase integration for authentication and storage Node.js v18.17.0 or later npm or yarn package manager Setting Up Stripe Account Create a Stripe account at stripe.com Navigate to the Stripe Dashboard Get your API keys from Developers > API keys Note both your Publishable Key and Secret Key Enable test mode for development Installing Required Packages Install the necessary packages: npm install stripe @stripe/stripe-js @stripe/react-stripe-js # or yarn add stripe @stripe/stripe-js @stripe/react-stripe-js Environment Configuration Create or update your .env.local file with Stripe configuration: # Stripe API Keys NEXT_PUBLIC_STRIPE_PUBLISHABLE_KEY=pk_test_your_publishable_key STRIPE_SECRET_KEY=sk_test_your_secret_key # Stripe Webhook Secret (you'll get this later) STRIPE_WEBHOOK_SECRET=whsec_your_webhook_secret # Your domain for Stripe redirects NEXT_PUBLIC_SITE_URL=http://localhost:3000 Stripe Client Integration 1. Create a Stripe context provider Create a file at lib/stripe/stripe-client.js: import { loadStripe } from '@stripe/stripe-js'; let stripePromise; export const getStripe = () => { if (!stripePromise) { stripePromise = loadStripe( process.env.NEXT_PUBLIC_STRIPE_PUBLISHABLE_KEY ); } return stripePromise; }; 2. Create a Stripe Elements provider component Create a file at components/StripeElementsProvider.jsx: 'use client'; import { Elements } from '@stripe/react-stripe-js'; import { getStripe } from '@/lib/stripe/stripe-client'; export default function StripeElementsProvider({ children, options }) { const stripePromise = getStripe(); return ( {children} ); } Stripe API Routes 1. Set up Stripe server-side instance Create a file at lib/stripe/stripe-server.js: import Stripe from 'stripe'; let stripe; export const getStripe = () => { if (!stripe) { stripe = new Stripe(process.env.STRIPE_SECRET_KEY, { apiVersion: '2023-10-16', // Use the latest API version }); } return stripe; }; 2. Create API route for creating payment intents Create a file at app/api/stripe/payment-intents/route.js: import { NextResponse } from 'next/server'; import { getStripe } from '@/lib/stripe/stripe-server'; import { createClient } from '@supabase/supabase-js'; export async function POST(request) { try { const { amount, currency = 'usd', paymentMethodType = 'card', metadata = {}, } = await request.json(); // Validate amount if (!amount || isNaN(amount) || amount ( {feature} ))} {hasCurrentPlan(plan.priceId) ? ( Current Plan ) : ( )} ))} ); } Webhook Handler Create a file at app/api/stripe/webhook/route.js: import { headers } from 'next/headers'; import { NextResponse } from 'next/server'; import { getStripe } from '@/lib/stripe/stripe-server'; import { createClient } from '@supabase/supabase-js'; // Buffer to string for webhook signature verification const buffer = async (readable) => { const chunks = []; for await (const chunk of readable) { chunks.push(typeof chunk === 'string' ? Buffer.from(chunk) : chunk); } return Buffer.concat(chunks); }; export async function POST(request) { try { const body = await request.text(); const signature = headers().get('stripe-signature'); if (!signature) { return NextResponse.json( { error: 'Missing Stripe signature' }, { status: 401 } ); } // Initialize Stripe const stripe = getStripe(); // Verify webhook signature let event; try { event = stripe.webhooks.constructEvent( body, signature, process.env.STRIPE_WEBHOOK_SECRET )

Apr 2, 2025 - 17:17

#33 Stripe Integration Guide for Next.js 15 with Supabase

This guide provides a step-by-step process to integrate Stripe payments into your Next.js 15 application with Supabase authentication.

Prerequisites

Before starting, ensure you have:

A Next.js 15 application set up
Supabase integration for authentication and storage
Node.js v18.17.0 or later
npm or yarn package manager

Setting Up Stripe Account

Create a Stripe account at stripe.com
Navigate to the Stripe Dashboard
Get your API keys from Developers > API keys
Note both your Publishable Key and Secret Key
Enable test mode for development

Installing Required Packages

Install the necessary packages:

npm install stripe @stripe/stripe-js @stripe/react-stripe-js
# or
yarn add stripe @stripe/stripe-js @stripe/react-stripe-js

Environment Configuration

Create or update your .env.local file with Stripe configuration:

# Stripe API Keys
NEXT_PUBLIC_STRIPE_PUBLISHABLE_KEY=pk_test_your_publishable_key
STRIPE_SECRET_KEY=sk_test_your_secret_key

# Stripe Webhook Secret (you'll get this later)
STRIPE_WEBHOOK_SECRET=whsec_your_webhook_secret

# Your domain for Stripe redirects
NEXT_PUBLIC_SITE_URL=http://localhost:3000

Stripe Client Integration

1. Create a Stripe context provider

Create a file at lib/stripe/stripe-client.js:

import { loadStripe } from '@stripe/stripe-js';

let stripePromise;

export const getStripe = () => {
    if (!stripePromise) {
        stripePromise = loadStripe(
            process.env.NEXT_PUBLIC_STRIPE_PUBLISHABLE_KEY
        );
    }
    return stripePromise;
};

2. Create a Stripe Elements provider component

Create a file at components/StripeElementsProvider.jsx:

'use client';

import { Elements } from '@stripe/react-stripe-js';
import { getStripe } from '@/lib/stripe/stripe-client';

export default function StripeElementsProvider({ children, options }) {
    const stripePromise = getStripe();

    return (
        <Elements stripe={stripePromise} options={options}>
            {children}
        Elements>
    );
}

Stripe API Routes

1. Set up Stripe server-side instance

Create a file at lib/stripe/stripe-server.js:

import Stripe from 'stripe';

let stripe;

export const getStripe = () => {
    if (!stripe) {
        stripe = new Stripe(process.env.STRIPE_SECRET_KEY, {
            apiVersion: '2023-10-16', // Use the latest API version
        });
    }
    return stripe;
};

2. Create API route for creating payment intents

Create a file at app/api/stripe/payment-intents/route.js:

import { NextResponse } from 'next/server';
import { getStripe } from '@/lib/stripe/stripe-server';
import { createClient } from '@supabase/supabase-js';

export async function POST(request) {
    try {
        const {
            amount,
            currency = 'usd',
            paymentMethodType = 'card',
            metadata = {},
        } = await request.json();

        // Validate amount
        if (!amount || isNaN(amount) || amount <= 0) {
            return NextResponse.json(
                { error: 'Invalid amount' },
                { status: 400 }
            );
        }

        // Initialize Supabase client
        const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL;
        const supabaseServiceKey = process.env.SUPABASE_SERVICE_ROLE_KEY;
        const supabase = createClient(supabaseUrl, supabaseServiceKey);

        // Get user from cookie (this assumes you're using Supabase Auth)
        const cookieStore = request.cookies;
        const supabaseAuthToken = cookieStore.get('sb-access-token')?.value;

        if (!supabaseAuthToken) {
            return NextResponse.json(
                { error: 'User not authenticated' },
                { status: 401 }
            );
        }

        // Get user from Supabase
        const {
            data: { user },
            error,
        } = await supabase.auth.getUser(supabaseAuthToken);

        if (error || !user) {
            return NextResponse.json(
                { error: 'User not found' },
                { status: 401 }
            );
        }

        // Add user ID to metadata
        const enhancedMetadata = {
            ...metadata,
            userId: user.id,
        };

        // Create a PaymentIntent with the order amount and currency
        const stripe = getStripe();
        const paymentIntent = await stripe.paymentIntents.create({
            amount: Math.round(amount * 100), // Stripe expects amount in cents
            currency,
            payment_method_types: [paymentMethodType],
            metadata: enhancedMetadata,
        });

        return NextResponse.json({
            clientSecret: paymentIntent.client_secret,
        });
    } catch (error) {
        console.error('Error creating payment intent:', error);
        return NextResponse.json({ error: error.message }, { status: 500 });
    }
}

3. Create API route for creating checkout sessions

Create a file at app/api/stripe/checkout-sessions/route.js:

import { NextResponse } from 'next/server';
import { getStripe } from '@/lib/stripe/stripe-server';
import { createClient } from '@supabase/supabase-js';

export async function POST(request) {
    try {
        const {
            priceId,
            mode = 'payment',
            successUrl = `${process.env.NEXT_PUBLIC_SITE_URL}/success`,
            cancelUrl = `${process.env.NEXT_PUBLIC_SITE_URL}/cancel`,
            metadata = {},
        } = await request.json();

        if (!priceId) {
            return NextResponse.json(
                { error: 'Price ID is required' },
                { status: 400 }
            );
        }

        // Initialize Supabase client
        const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL;
        const supabaseServiceKey = process.env.SUPABASE_SERVICE_ROLE_KEY;
        const supabase = createClient(supabaseUrl, supabaseServiceKey);

        // Get user from cookie
        const cookieStore = request.cookies;
        const supabaseAuthToken = cookieStore.get('sb-access-token')?.value;

        if (!supabaseAuthToken) {
            return NextResponse.json(
                { error: 'User not authenticated' },
                { status: 401 }
            );
        }

        // Get user from Supabase
        const {
            data: { user },
            error,
        } = await supabase.auth.getUser(supabaseAuthToken);

        if (error || !user) {
            return NextResponse.json(
                { error: 'User not found' },
                { status: 401 }
            );
        }

        // Add user ID to metadata
        const enhancedMetadata = {
            ...metadata,
            userId: user.id,
        };

        // Create Checkout Session
        const stripe = getStripe();
        const session = await stripe.checkout.sessions.create({
            mode,
            payment_method_types: ['card'],
            line_items: [
                {
                    price: priceId,
                    quantity: 1,
                },
            ],
            success_url: `${successUrl}?session_id={CHECKOUT_SESSION_ID}`,
            cancel_url: cancelUrl,
            metadata: enhancedMetadata,
            customer_email: user.email, // Pre-fill customer email
        });

        return NextResponse.json({
            sessionId: session.id,
            url: session.url,
        });
    } catch (error) {
        console.error('Error creating checkout session:', error);
        return NextResponse.json({ error: error.message }, { status: 500 });
    }
}

4. Create API route for subscriptions

Create a file at app/api/stripe/subscriptions/route.js:

import { NextResponse } from 'next/server';
import { getStripe } from '@/lib/stripe/stripe-server';
import { createClient } from '@supabase/supabase-js';

export async function POST(request) {
    try {
        const {
            priceId,
            successUrl = `${process.env.NEXT_PUBLIC_SITE_URL}/subscription/success`,
            cancelUrl = `${process.env.NEXT_PUBLIC_SITE_URL}/subscription/cancel`,
            metadata = {},
        } = await request.json();

        if (!priceId) {
            return NextResponse.json(
                { error: 'Price ID is required' },
                { status: 400 }
            );
        }

        // Initialize Supabase client
        const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL;
        const supabaseServiceKey = process.env.SUPABASE_SERVICE_ROLE_KEY;
        const supabase = createClient(supabaseUrl, supabaseServiceKey);

        // Get user from cookie
        const cookieStore = request.cookies;
        const supabaseAuthToken = cookieStore.get('sb-access-token')?.value;

        if (!supabaseAuthToken) {
            return NextResponse.json(
                { error: 'User not authenticated' },
                { status: 401 }
            );
        }

        // Get user from Supabase
        const {
            data: { user },
            error,
        } = await supabase.auth.getUser(supabaseAuthToken);

        if (error || !user) {
            return NextResponse.json(
                { error: 'User not found' },
                { status: 401 }
            );
        }

        // Check if user already has a Stripe customer ID
        const { data: customerData } = await supabase
            .from('customers')
            .select('stripe_customer_id')
            .eq('user_id', user.id)
            .single();

        const stripe = getStripe();
        let customerId;

        // If no customer ID exists, create one
        if (!customerData?.stripe_customer_id) {
            const customer = await stripe.customers.create({
                email: user.email,
                metadata: {
                    userId: user.id,
                },
            });

            customerId = customer.id;

            // Save Stripe customer ID to Supabase
            await supabase.from('customers').insert({
                user_id: user.id,
                stripe_customer_id: customerId,
            });
        } else {
            customerId = customerData.stripe_customer_id;
        }

        // Add user ID to metadata
        const enhancedMetadata = {
            ...metadata,
            userId: user.id,
        };

        // Create subscription checkout session
        const session = await stripe.checkout.sessions.create({
            customer: customerId,
            mode: 'subscription',
            payment_method_types: ['card'],
            line_items: [
                {
                    price: priceId,
                    quantity: 1,
                },
            ],
            success_url: `${successUrl}?session_id={CHECKOUT_SESSION_ID}`,
            cancel_url: cancelUrl,
            metadata: enhancedMetadata,
        });

        return NextResponse.json({
            sessionId: session.id,
            url: session.url,
        });
    } catch (error) {
        console.error('Error creating subscription:', error);
        return NextResponse.json({ error: error.message }, { status: 500 });
    }
}

// GET route to fetch user subscriptions
export async function GET(request) {
    try {
        // Initialize Supabase client
        const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL;
        const supabaseServiceKey = process.env.SUPABASE_SERVICE_ROLE_KEY;
        const supabase = createClient(supabaseUrl, supabaseServiceKey);

        // Get user from cookie
        const cookieStore = request.cookies;
        const supabaseAuthToken = cookieStore.get('sb-access-token')?.value;

        if (!supabaseAuthToken) {
            return NextResponse.json(
                { error: 'User not authenticated' },
                { status: 401 }
            );
        }

        // Get user from Supabase
        const {
            data: { user },
            error,
        } = await supabase.auth.getUser(supabaseAuthToken);

        if (error || !user) {
            return NextResponse.json(
                { error: 'User not found' },
                { status: 401 }
            );
        }

        // Get customer ID from Supabase
        const { data: customerData } = await supabase
            .from('customers')
            .select('stripe_customer_id')
            .eq('user_id', user.id)
            .single();

        if (!customerData?.stripe_customer_id) {
            return NextResponse.json({
                subscriptions: [],
            });
        }

        // Get subscriptions from Stripe
        const stripe = getStripe();
        const subscriptions = await stripe.subscriptions.list({
            customer: customerData.stripe_customer_id,
            status: 'active',
            expand: [
                'data.default_payment_method',
                'data.items.data.price.product',
            ],
        });

        return NextResponse.json({
            subscriptions: subscriptions.data,
        });
    } catch (error) {
        console.error('Error fetching subscriptions:', error);
        return NextResponse.json({ error: error.message }, { status: 500 });
    }
}

Payment Flows

One-time Payments

1. Create a payment component using Elements

Create a file at components/CheckoutForm.jsx:

'use client';

import { useState } from 'react';
import { CardElement, useStripe, useElements } from '@stripe/react-stripe-js';
import StripeElementsProvider from './StripeElementsProvider';

const CheckoutFormInner = ({ amount, onSuccess, onError }) => {
    const stripe = useStripe();
    const elements = useElements();
    const [isLoading, setIsLoading] = useState(false);
    const [errorMessage, setErrorMessage] = useState(null);

    const handleSubmit = async (e) => {
        e.preventDefault();

        if (!stripe || !elements) {
            return;
        }

        setIsLoading(true);
        setErrorMessage(null);

        try {
            // Create a payment intent on the server
            const response = await fetch('/api/stripe/payment-intents', {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                },
                body: JSON.stringify({
                    amount,
                }),
            });

            const data = await response.json();

            if (!response.ok) {
                throw new Error(data.error || 'Something went wrong');
            }

            // Confirm the payment on the client
            const { error, paymentIntent } = await stripe.confirmCardPayment(
                data.clientSecret,
                {
                    payment_method: {
                        card: elements.getElement(CardElement),
                    },
                }
            );

            if (error) {
                throw new Error(error.message);
            }

            if (paymentIntent.status === 'succeeded') {
                if (onSuccess) {
                    onSuccess(paymentIntent);
                }
            }
        } catch (error) {
            setErrorMessage(error.message);
            if (onError) {
                onError(error);
            }
        } finally {
            setIsLoading(false);
        }
    };

    return (
        <form onSubmit={handleSubmit} className='space-y-4'>
            <div className='p-4 border rounded-md'>
                <CardElement
                    options={{
                        style: {
                            base: {
                                fontSize: '16px',
                                color: '#424770',
                                '::placeholder': {
                                    color: '#aab7c4',
                                },
                            },
                            invalid: {
                                color: '#9e2146',
                            },
                        },
                    }}
                />
            div>

            {errorMessage && (
                <div className='text-red-500 text-sm'>{errorMessage}div>
            )}

            <button
                type='submit'
                disabled={!stripe || isLoading}
                className='px-4 py-2 bg-blue-600 text-white rounded-md disabled:opacity-50'
            >
                {isLoading ? 'Processing...' : `Pay $${amount.toFixed(2)}`}
            button>
        form>
    );
};

export default function CheckoutForm({ amount, onSuccess, onError }) {
    return (
        <StripeElementsProvider>
            <CheckoutFormInner
                amount={amount}
                onSuccess={onSuccess}
                onError={onError}
            />
        StripeElementsProvider>
    );
}

2. Create a checkout page

Create a file at app/checkout/page.jsx:

'use client';

import { useState } from 'react';
import { useRouter } from 'next/navigation';
import CheckoutForm from '@/components/CheckoutForm';

export default function CheckoutPage() {
    const router = useRouter();
    const [isSuccess, setIsSuccess] = useState(false);

    // Sample product
    const product = {
        name: 'Sample Product',
        price: 19.99,
        description: 'This is a sample product for testing Stripe integration',
    };

    const handleSuccess = (paymentIntent) => {
        setIsSuccess(true);
        // Navigate to success page after a short delay
        setTimeout(() => {
            router.push(`/success?payment_intent=${paymentIntent.id}`);
        }, 1500);
    };

    const handleError = (error) => {
        console.error('Payment error:', error);
    };

    return (
        <div className='max-w-md mx-auto my-8 p-6 bg-white rounded-lg shadow-md'>
            <h1 className='text-2xl font-bold mb-4'>Checkouth1>

            {isSuccess ? (
                <div className='text-green-600 font-semibold mb-4'>
                    Payment successful! Redirecting...
                div>
            ) : (
                <>
                    <div className='mb-6'>
                        <h2 className='text-xl font-semibold'>
                            {product.name}
                        h2>
                        <p className='text-gray-600'>{product.description}p>
                        <div className='text-xl font-bold mt-2'>
                            ${product.price.toFixed(2)}
                        div>
                    div>

                    <CheckoutForm
                        amount={product.price}
                        onSuccess={handleSuccess}
                        onError={handleError}
                    />
                
            )}
        div>
    );
}

3. Create a success page

Create a file at app/success/page.jsx:

'use client';

import { useEffect, useState } from 'react';
import { useSearchParams } from 'next/navigation';
import Link from 'next/link';

export default function SuccessPage() {
    const searchParams = useSearchParams();
    const sessionId = searchParams.get('session_id');
    const paymentIntentId = searchParams.get('payment_intent');
    const [paymentDetails, setPaymentDetails] = useState(null);
    const [loading, setLoading] = useState(true);

    useEffect(() => {
        const getPaymentDetails = async () => {
            try {
                if (sessionId) {
                    // If we have a checkout session ID, fetch session details
                    const response = await fetch(
                        `/api/stripe/checkout-sessions/${sessionId}`
                    );
                    if (response.ok) {
                        const data = await response.json();
                        setPaymentDetails(data.session);
                    }
                } else if (paymentIntentId) {
                    // If we have a payment intent ID, fetch payment intent details
                    const response = await fetch(
                        `/api/stripe/payment-intents/${paymentIntentId}`
                    );
                    if (response.ok) {
                        const data = await response.json();
                        setPaymentDetails(data.paymentIntent);
                    }
                }
            } catch (error) {
                console.error('Error fetching payment details:', error);
            } finally {
                setLoading(false);
            }
        };

        getPaymentDetails();
    }, [sessionId, paymentIntentId]);

    return (
        <div className='max-w-md mx-auto my-8 p-6 bg-white rounded-lg shadow-md'>
            <div className='text-center mb-6'>
                <div className='inline-flex items-center justify-center w-16 h-16 bg-green-100 rounded-full mb-4'>
                    <svg
                        xmlns='http://www.w3.org/2000/svg'
                        className='h-8 w-8 text-green-600'
                        fill='none'
                        viewBox='0 0 24 24'
                        stroke='currentColor'
                    >
                        <path
                            strokeLinecap='round'
                            strokeLinejoin='round'
                            strokeWidth={2}
                            d='M5 13l4 4L19 7'
                        />
                    svg>
                div>
                <h1 className='text-2xl font-bold text-green-600'>
                    Payment Successful!
                h1>
                <p className='text-gray-600 mt-2'>
                    Thank you for your purchase. Your payment has been processed
                    successfully.
                p>
            div>

            {loading ? (
                <p className='text-center text-gray-500'>
                    Loading payment details...
                p>
            ) : paymentDetails ? (
                <div className='border-t border-gray-200 pt-4'>
                    <h2 className='text-lg font-semibold mb-2'>
                        Payment Details
                    h2>
                    <p className='text-gray-700'>
                        Amount: ${(paymentDetails.amount / 100).toFixed(2)}
                    p>
                    <p className='text-gray-700'>
                        Date:{' '}
                        {new Date(
                            paymentDetails.created * 1000
                        ).toLocaleDateString()}
                    p>
                    <p className='text-gray-700'>
                        Payment ID: {paymentDetails.id}
                    p>
                div>
            ) : null}

            <div className='mt-6 text-center'>
                <Link href='/' className='text-blue-600 hover:text-blue-800'>
                    Return to Home
                Link>
            div>
        div>
    );
}

Subscriptions

1. Create a subscription checkout button component

Create a file at components/SubscribeButton.jsx:

'use client';

import { useState } from 'react';
import { getStripe } from '@/lib/stripe/stripe-client';

export default function SubscribeButton({ priceId, buttonText = 'Subscribe' }) {
    const [isLoading, setIsLoading] = useState(false);
    const [error, setError] = useState(null);

    const handleSubscribe = async () => {
        setIsLoading(true);
        setError(null);

        try {
            const response = await fetch('/api/stripe/subscriptions', {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                },
                body: JSON.stringify({
                    priceId,
                }),
            });

            const data = await response.json();

            if (!response.ok) {
                throw new Error(data.error || 'Something went wrong');
            }

            // Redirect to Stripe Checkout
            if (data.url) {
                window.location.href = data.url;
            } else {
                // If no URL is provided, redirect using the session ID
                const stripe = await getStripe();
                const { error } = await stripe.redirectToCheckout({
                    sessionId: data.sessionId,
                });

                if (error) throw error;
            }
        } catch (error) {
            setError(error.message);
            console.error('Error subscribing:', error);
        } finally {
            setIsLoading(false);
        }
    };

    return (
        <div>
            <button
                onClick={handleSubscribe}
                disabled={isLoading}
                className='px-4 py-2 bg-blue-600 text-white rounded-md hover:bg-blue-700 disabled:opacity-50'
            >
                {isLoading ? 'Processing...' : buttonText}
            button>

            {error && <div className='text-red-500 text-sm mt-2'>{error}div>}
        div>
    );
}

2. Create a pricing page with subscription options

Create a file at app/pricing/page.jsx:

'use client';

import { useState, useEffect } from 'react';
import SubscribeButton from '@/components/SubscribeButton';
import { useRouter } from 'next/navigation';
import { useSupabase } from '@/lib/supabase/client'; // Assuming you have this hook

export default function PricingPage() {
    const router = useRouter();
    const { supabase, user } = useSupabase();
    const [subscription, setSubscription] = useState(null);
    const [loading, setLoading] = useState(true);

    // Pricing plans - in a real app, you would fetch these from Stripe
    const pricingPlans = [
        {
            name: 'Basic',
            description: 'For individuals and small projects',
            price: '$9.99',
            interval: 'month',
            features: ['Feature 1', 'Feature 2', 'Feature 3'],
            priceId: 'price_1NxYzABCDEFGHIJK', // Your actual Stripe Price ID
        },
        {
            name: 'Pro',
            description: 'For professionals and teams',
            price: '$19.99',
            interval: 'month',
            features: [
                'All Basic features',
                'Feature 4',
                'Feature 5',
                'Feature 6',
            ],
            priceId: 'price_2OyZaBCDEFGHIJK', // Your actual Stripe Price ID
            popular: true,
        },
        {
            name: 'Enterprise',
            description: 'For large organizations',
            price: '$49.99',
            interval: 'month',
            features: [
                'All Pro features',
                'Feature 7',
                'Feature 8',
                'Feature 9',
                'Priority support',
            ],
            priceId: 'price_3PzZbBCDEFGHIJK', // Your actual Stripe Price ID
        },
    ];

    useEffect(() => {
        const checkUser = async () => {
            if (!user) {
                router.push('/login?redirect=/pricing');
                return;
            }

            try {
                // Fetch current subscription
                const response = await fetch('/api/stripe/subscriptions');
                const data = await response.json();

                if (response.ok && data.subscriptions.length > 0) {
                    setSubscription(data.subscriptions[0]);
                }
            } catch (error) {
                console.error('Error fetching subscription:', error);
            } finally {
                setLoading(false);
            }
        };

        checkUser();
    }, [user, router]);

    // Helper function to check if user has the current plan
    const hasCurrentPlan = (priceId) => {
        if (!subscription) return false;

        return subscription.items.data.some(
            (item) => item.price.id === priceId
        );
    };

    // Handle subscription cancellation
    const handleCancelSubscription = async () => {
        if (!subscription) return;

        try {
            setLoading(true);

            const response = await fetch(
                `/api/stripe/subscriptions/${subscription.id}`,
                {
                    method: 'DELETE',
                }
            );

            if (response.ok) {
                setSubscription(null);
                alert('Subscription cancelled successfully');
            } else {
                const data = await response.json();
                throw new Error(data.error || 'Failed to cancel subscription');
            }
        } catch (error) {
            console.error('Error cancelling subscription:', error);
            alert(error.message);
        } finally {
            setLoading(false);
        }
    };

    if (!user) {
        return (
            <div className='flex justify-center items-center h-64'>
                <p>Please login to view pricing...p>
            div>
        );
    }

    if (loading) {
        return (
            <div className='flex justify-center items-center h-64'>
                <p>Loading pricing options...p>
            div>
        );
    }

    return (
        <div className='max-w-6xl mx-auto py-12 px-4 sm:px-6 lg:px-8'>
            <div className='text-center mb-12'>
                <h1 className='text-3xl font-extrabold text-gray-900 sm:text-4xl'>
                    Pricing Plans
                h1>
                <p className='mt-4 text-xl text-gray-600'>
                    Choose the perfect plan for your needs
                p>
            div>

            {subscription && (
                <div className='mb-12 max-w-md mx-auto bg-green-50 rounded-lg p-6 border border-green-200'>
                    <h2 className='text-xl font-semibold text-gray-900'>
                        Your Current Subscription
                    h2>
                    <p className='text-gray-600 mt-2'>
                        You are currently subscribed to the{' '}
                        {subscription.items.data[0].price.product.name} plan.
                    p>
                    <p className='text-gray-600 mt-2'>
                        Next billing date:{' '}
                        {new Date(
                            subscription.current_period_end * 1000
                        ).toLocaleDateString()}
                    p>
                    <button
                        onClick={handleCancelSubscription}
                        className='mt-4 px-4 py-2 bg-red-600 text-white rounded-md hover:bg-red-700'
                    >
                        Cancel Subscription
                    button>
                div>
            )}

            <div className='grid gap-6 lg:grid-cols-3 lg:gap-8'>
                {pricingPlans.map((plan) => (
                    <div
                        key={plan.name}
                        className={`bg-white rounded-lg shadow-lg divide-y divide-gray-200 ${
                            plan.popular
                                ? 'border-2 border-blue-500 relative'
                                : ''
                        }`}
                    >
                        {plan.popular && (
                            <div className='absolute top-0 right-0 transform translate-x-2 -translate-y-2'>
                                <span className='bg-blue-500 text-white text-xs font-semibold px-3 py-1 rounded-full'>
                                    Popular
                                span>
                            div>
                        )}

                        <div className='p-6'>
                            <h2 className='text-xl font-semibold text-gray-900'>
                                {plan.name}
                            h2>
                            <p className='mt-2 text-gray-600'>
                                {plan.description}
                            p>
                            <p className='mt-4'>
                                <span className='text-3xl font-extrabold text-gray-900'>
                                    {plan.price}
                                span>
                                <span className='text-base font-medium text-gray-500'>
                                    /{plan.interval}
                                span>
                            p>
                        div>

                        <div className='px-6 pt-6 pb-4'>
                            <h3 className='text-sm font-semibold text-gray-900 uppercase tracking-wide'>
                                What's included
                            h3>
                            <ul className='mt-4 space-y-3'>
                                {plan.features.map((feature) => (
                                    <li key={feature} className='flex'>
                                        <svg
                                            className='h-5 w-5 text-green-500'
                                            fill='none'
                                            viewBox='0 0 24 24'
                                            stroke='currentColor'
                                        >
                                            <path
                                                strokeLinecap='round'
                                                strokeLinejoin='round'
                                                strokeWidth={2}
                                                d='M5 13l4 4L19 7'
                                            />
                                        svg>
                                        <span className='ml-3 text-gray-700'>
                                            {feature}
                                        span>
                                    li>
                                ))}
                            ul>
                        div>

                        <div className='px-6 py-4'>
                            {hasCurrentPlan(plan.priceId) ? (
                                <div className='inline-flex items-center px-4 py-2 border border-transparent text-sm font-medium rounded-md shadow-sm text-white bg-green-600'>
                                    Current Plan
                                div>
                            ) : (
                                <SubscribeButton
                                    priceId={plan.priceId}
                                    buttonText={
                                        subscription
                                            ? 'Change Plan'
                                            : 'Subscribe'
                                    }
                                />
                            )}
                        div>
                    div>
                ))}
            div>
        div>
    );
}

Webhook Handler

Create a file at app/api/stripe/webhook/route.js:

import { headers } from 'next/headers';
import { NextResponse } from 'next/server';
import { getStripe } from '@/lib/stripe/stripe-server';
import { createClient } from '@supabase/supabase-js';

// Buffer to string for webhook signature verification
const buffer = async (readable) => {
    const chunks = [];
    for await (const chunk of readable) {
        chunks.push(typeof chunk === 'string' ? Buffer.from(chunk) : chunk);
    }
    return Buffer.concat(chunks);
};

export async function POST(request) {
    try {
        const body = await request.text();
        const signature = headers().get('stripe-signature');

        if (!signature) {
            return NextResponse.json(
                { error: 'Missing Stripe signature' },
                { status: 401 }
            );
        }

        // Initialize Stripe
        const stripe = getStripe();

        // Verify webhook signature
        let event;
        try {
            event = stripe.webhooks.constructEvent(
                body,
                signature,
                process.env.STRIPE_WEBHOOK_SECRET
            );
        } catch (err) {
            console.error(
                `Webhook signature verification failed: ${err.message}`
            );
            return NextResponse.json(
                {
                    error: `Webhook signature verification failed: ${err.message}`,
                },
                { status: 400 }
            );
        }

        // Initialize Supabase
        const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL;
        const supabaseServiceKey = process.env.SUPABASE_SERVICE_ROLE_KEY;
        const supabase = createClient(supabaseUrl, supabaseServiceKey);

        // Handle specific Stripe events
        switch (event.type) {
            case 'checkout.session.completed':
                const session = event.data.object;

                // Extract user ID from metadata
                const userId = session.metadata?.userId;

                if (userId) {
                    if (session.mode === 'subscription') {
                        // Handle subscription payment
                        await handleSuccessfulSubscription(
                            session,
                            userId,
                            supabase
                        );
                    } else {
                        // Handle one-time payment
                        await handleSuccessfulPayment(
                            session,
                            userId,
                            supabase
                        );
                    }
                }
                break;

            case 'invoice.paid':
                // Handle successful invoice payment
                await handleSuccessfulInvoice(event.data.object, supabase);
                break;

            case 'invoice.payment_failed':
                // Handle failed invoice payment
                await handleFailedInvoice(event.data.object, supabase);
                break;

            case 'customer.subscription.deleted':
                // Handle subscription cancellation
                await handleSubscriptionCancelled(event.data.object, supabase);
                break;

            // Add more event handlers as needed
        }

        return NextResponse.json({ received: true });
    } catch (error) {
        console.error('Webhook error:', error);
        return NextResponse.json({ error: error.message }, { status: 500 });
    }
}

// Helper functions for handling webhook events

async function handleSuccessfulPayment(session, userId, supabase) {
    // Record the payment in your database
    await supabase.from('payments').insert({
        user_id: userId,
        stripe_checkout_id: session.id,
        amount: session.amount_total,
        currency: session.currency,
        status: 'completed',
        payment_intent: session.payment_intent,
        payment_method: session.payment_method_types?.[0] || 'unknown',
        created_at: new Date().toISOString(),
    });

    // Update user's access level or entitlements if needed
    // This depends on your specific business logic
}

async function handleSuccessfulSubscription(session, userId, supabase) {
    // Get the customer and subscription IDs
    const subscriptionId = session.subscription;
    const customerId = session.customer;

    // Verify subscription details
    const stripe = getStripe();
    const subscription = await stripe.subscriptions.retrieve(subscriptionId);
    const priceId = subscription.items.data[0].price.id;

    // Record the subscription in your database
    await supabase.from('subscriptions').insert({
        user_id: userId,
        stripe_customer_id: customerId,
        stripe_subscription_id: subscriptionId,
        stripe_price_id: priceId,
        status: subscription.status,
        current_period_start: new Date(
            subscription.current_period_start * 1000
        ).toISOString(),
        current_period_end: new Date(
            subscription.current_period_end * 1000
        ).toISOString(),
        created_at: new Date().toISOString(),
    });

    // Update user's access level based on the subscription
    await supabase
        .from('profiles')
        .update({
            subscription_status: subscription.status,
            subscription_plan: priceId,
        })
        .eq('user_id', userId);
}

async function handleSuccessfulInvoice(invoice, supabase) {
    const customerId = invoice.customer;
    const subscriptionId = invoice.subscription;

    if (!subscriptionId) {
        // This is not a subscription invoice
        return;
    }

    // Find the customer in your database
    const { data: customerData } = await supabase
        .from('customers')
        .select('user_id')
        .eq('stripe_customer_id', customerId)
        .single();

    if (!customerData?.user_id) {
        console.error('Customer not found:', customerId);
        return;
    }

    // Update subscription status
    await supabase
        .from('subscriptions')
        .update({
            status: 'active',
            current_period_end: new Date(
                invoice.lines.data[0].period.end * 1000
            ).toISOString(),
        })
        .eq('stripe_subscription_id', subscriptionId);

    // Update user's subscription status
    await supabase
        .from('profiles')
        .update({
            subscription_status: 'active',
        })
        .eq('user_id', customerData.user_id);
}

async function handleFailedInvoice(invoice, supabase) {
    const customerId = invoice.customer;
    const subscriptionId = invoice.subscription;

    if (!subscriptionId) {
        // This is not a subscription invoice
        return;
    }

    // Find the customer in your database
    const { data: customerData } = await supabase
        .from('customers')
        .select('user_id')
        .eq('stripe_customer_id', customerId)
        .single();

    if (!customerData?.user_id) {
        console.error('Customer not found:', customerId);
        return;
    }

    // Update subscription status
    await supabase
        .from('subscriptions')
        .update({
            status: 'past_due',
        })
        .eq('stripe_subscription_id', subscriptionId);

    // Update user's subscription status
    await supabase
        .from('profiles')
        .update({
            subscription_status: 'past_due',
        })
        .eq('user_id', customerData.user_id);
}

async function handleSubscriptionCancelled(subscription, supabase) {
    const subscriptionId = subscription.id;

    // Update subscription in your database
    await supabase
        .from('subscriptions')
        .update({
            status: 'cancelled',
            cancelled_at: new Date().toISOString(),
        })
        .eq('stripe_subscription_id', subscriptionId);

    // Find the user associated with this subscription
    const { data: subscriptionData } = await supabase
        .from('subscriptions')
        .select('user_id')
        .eq('stripe_subscription_id', subscriptionId)
        .single();

    if (subscriptionData?.user_id) {
        // Update user's subscription status
        await supabase
            .from('profiles')
            .update({
                subscription_status: 'cancelled',
                subscription_plan: null,
            })
            .eq('user_id', subscriptionData.user_id);
    }
}

// This is needed to parse the body as a stream for the webhook signature verification
export const config = {
    api: {
        bodyParser: false,
    },
};

Supabase Integration

1. Add Stripe Customer ID to Supabase User Table

Create a Supabase migration to add a stripe_customer_id column to your users table:

-- Create customers table to store Stripe customer IDs
CREATE TABLE IF NOT EXISTS customers (
  id SERIAL PRIMARY KEY,
  user_id UUID NOT NULL REFERENCES auth.users(id) ON DELETE CASCADE,
  stripe_customer_id TEXT NOT NULL,
  created_at TIMESTAMP WITH TIME ZONE DEFAULT TIMEZONE('utc', NOW()),
  UNIQUE(user_id),
  UNIQUE(stripe_customer_id)
);

-- Create payments table to track one-time payments
CREATE TABLE IF NOT EXISTS payments (
  id SERIAL PRIMARY KEY,
  user_id UUID NOT NULL REFERENCES auth.users(id) ON DELETE CASCADE,
  stripe_checkout_id TEXT,
  stripe_payment_intent_id TEXT,
  amount INTEGER NOT NULL,
  currency TEXT NOT NULL,
  status TEXT NOT NULL,
  payment_method TEXT,
  created_at TIMESTAMP WITH TIME ZONE DEFAULT TIMEZONE('utc', NOW())
);

-- Create subscriptions table to track user subscriptions
CREATE TABLE IF NOT EXISTS subscriptions (
  id SERIAL PRIMARY KEY,
  user_id UUID NOT NULL REFERENCES auth.users(id) ON DELETE CASCADE,
  stripe_customer_id TEXT NOT NULL,
  stripe_subscription_id TEXT NOT NULL,
  stripe_price_id TEXT NOT NULL,
  status TEXT NOT NULL,
  current_period_start TIMESTAMP WITH TIME ZONE NOT NULL,
  current_period_end TIMESTAMP WITH TIME ZONE NOT NULL,
  cancelled_at TIMESTAMP WITH TIME ZONE,
  created_at TIMESTAMP WITH TIME ZONE DEFAULT TIMEZONE('utc', NOW()),
  UNIQUE(stripe_subscription_id)
);

-- Add subscription fields to profiles table if it exists
-- If you don't have a profiles table, you should create one
ALTER TABLE IF EXISTS profiles
ADD COLUMN IF NOT EXISTS subscription_status TEXT,
ADD COLUMN IF NOT EXISTS subscription_plan TEXT;

2. Create a Supabase client hook (if you haven't already)

Create a file at lib/supabase/client.js:

'use client';

import { createContext, useContext, useEffect, useState } from 'react';
import { createClient } from '@supabase/supabase-js';

// Create a Supabase client
const createBrowserClient = () => {
    return createClient(
        process.env.NEXT_PUBLIC_SUPABASE_URL,
        process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY
    );
};

// Create a context for the Supabase client
const SupabaseContext = createContext(null);

// Provider component to wrap your app
export function SupabaseProvider({ children }) {
    const [supabase] = useState(() => createBrowserClient());
    const [user, setUser] = useState(null);
    const [loading, setLoading] = useState(true);

    useEffect(() => {
        const {
            data: { subscription },
        } = supabase.auth.onAuthStateChange(async (event, session) => {
            setUser(session?.user || null);
            setLoading(false);
        });

        // Initial check
        const checkUser = async () => {
            const {
                data: { session },
            } = await supabase.auth.getSession();
            setUser(session?.user || null);
            setLoading(false);
        };

        checkUser();

        return () => {
            subscription?.unsubscribe();
        };
    }, [supabase]);

    return (
        <SupabaseContext.Provider value={{ supabase, user, loading }}>
            {children}
        </SupabaseContext.Provider>
    );
}

// Hook to use the Supabase client
export function useSupabase() {
    const context = useContext(SupabaseContext);
    if (!context) {
        throw new Error('useSupabase must be used within a SupabaseProvider');
    }
    return context;
}

3. Update your app layout to include the Supabase provider

Update file at app/layout.jsx:

import { SupabaseProvider } from '@/lib/supabase/client';
import './globals.css';

export const metadata = {
    title: 'My Next.js App with Stripe and Supabase',
    description:
        'A Next.js app with Stripe payments and Supabase authentication',
};

export default function RootLayout({ children }) {
    return (
        <html lang='en'>
            <body>
                <SupabaseProvider>{children}SupabaseProvider>
            body>
        html>
    );
}

Testing

1. Set up Stripe CLI for local testing

Download and install the Stripe CLI
Login to your Stripe account:
```
stripe login
```

Start the webhook forwarding:

stripe listen --forward-to http://localhost:3000/api/stripe/webhook

The CLI will output a webhook signing secret. Add this to your .env.local file:
```
STRIPE_WEBHOOK_SECRET=whsec_your_webhook_secret_from_cli
```

2. Use Stripe test cards for testing

For testing payments, use Stripe's test card numbers:

Successful payment: 4242 4242 4242 4242
Payment requires authentication: 4000 0025 0000 3155
Payment declined: 4000 0000 0000 0002

3. Testing checklist

Ensure the Stripe dashboard is set to test mode
Test one-time payments
Test subscription creation
Test subscription cancellation
Test webhook handling
Verify Supabase data is updated correctly

Going to Production

1. Update environment variables

For production, update your environment variables with production API keys:

# Production Stripe API Keys
NEXT_PUBLIC_STRIPE_PUBLISHABLE_KEY=pk_live_your_publishable_key
STRIPE_SECRET_KEY=sk_live_your_secret_key

# Production Webhook Secret (from Stripe Dashboard)
STRIPE_WEBHOOK_SECRET=whsec_your_live_webhook_secret

# Production URL
NEXT_PUBLIC_SITE_URL=https://your-production-domain.com

2. Set up production webhooks

Go to the Stripe Dashboard > Developers > Webhooks
Add an endpoint with your production URL (e.g., https://your-production-domain.com/api/stripe/webhook)
Select the events you want to listen for (at minimum: checkout.session.completed, invoice.paid, invoice.payment_failed, customer.subscription.deleted)
Copy the webhook signing secret and add it to your environment variables

3. Final checklist before going live

Ensure your Stripe account is fully verified for production
Test the integration in production mode with a small real payment
Verify that webhooks are being received correctly
Implement proper error handling and monitoring
Set up Stripe email receipts
Configure tax settings if applicable
Ensure compliance with local payment regulations

Conclusion

You now have a complete Stripe integration for your Next.js 15 application with Supabase authentication. This implementation supports:

One-time payments via Elements and Checkout Sessions
Subscription management
Webhook handling
Integration with user accounts

Remember to keep your API keys secure and never expose your Stripe secret key to the client-side code. All sensitive operations should be handled on the server-side through API routes.

Read this article and more on fzeba.com.