social-media/backend/Infrastructure/Payments/Stripe/Services/MembershipPaymentProcessor.cs

using Hutopy.Infrastructure.Payments.Stripe.Configuration;
using Hutopy.Modules.Creators.Contracts;
using Hutopy.Modules.Memberships.Contracts;
using Microsoft.Extensions.Options;
using Stripe;
using Stripe.Checkout;

namespace Hutopy.Infrastructure.Payments.Stripe.Services;

public class MembershipPaymentProcessor(
    IOptions<StripeOptions> stripeOptions)
: IMembershipPaymentProcessor
{
    public async Task<MembershipCheckoutSession> CreateCheckoutSessionAsync(
        Guid userId,
        CreatorReference creatorReference,
        Guid tierId,
        string priceId,
        string successUrl,
        string cancelUrl)
    {
        StripeConfiguration.ApiKey = stripeOptions.Value.SecretKey;

        // Create Stripe customer for the user if not already created
        var customerService = new CustomerService();
        var customer = await customerService.CreateAsync(
            new CustomerCreateOptions
            {
                Metadata = new Dictionary<string, string> { { "userId", userId.ToString() } }
            });

        // Create Checkout Session for the subscription
        var sessionService = new SessionService();
        var session = await sessionService.CreateAsync(
            new SessionCreateOptions
            {
                Customer = customer.Id,
                PaymentMethodTypes = ["card"],
                LineItems =
                [
                    new SessionLineItemOptions { Price = priceId, Quantity = 1 }
                ],
                Mode = "subscription",
                SubscriptionData = new SessionSubscriptionDataOptions
                {
                    ApplicationFeePercent = stripeOptions.Value.HutopyRate,
                    TransferData = new SessionSubscriptionDataTransferDataOptions { Destination = creatorReference.StripeAccountId }
                },
                SuccessUrl = successUrl, // Redirect after successful payment
                CancelUrl = cancelUrl, // Redirect after canceled payment
                Metadata = new Dictionary<string, string>
                {
                    { "userId", userId.ToString() },
                    { "creatorId", creatorReference.Id.ToString() },
                    { "creatorName", creatorReference.Name },
                    { "tierId", tierId.ToString() }
                }
            });

        return new MembershipCheckoutSession(
            session.Id,
            session.Url);
    }

}