This code snippet is divided in two parts: The first file is responsible for creating the product and price in Stripe, and the second file is responsible for creating the split payment session.

​
Pre-made function to create products and prices using Stripe API

createProductAndPrice.ts
import Stripe from "stripe";

const stripe = new Stripe(process.env.STRIPE_SECRET_KEY as string, {
  apiVersion: "2023-08-16",
});

export const createProductAndPrice = async (
  projectPrice: number,
  projectName: string,
  image: string,
  description: string
) => {
  const product = await stripe.products.create({
    name: projectName,
    images: [image],
    description,
    unit_label: "projeto",
  });

  const price = await stripe.prices.create({
    currency: "brl",
    unit_amount: projectPrice * 100,
    product: product.id,
  });

  return { product, price };
};

​
Route to create the split payment

The code below must receive a JSON with the following structure: 
{
  "name": "Project Name",
  "icon": "Project Image",
  "description": "Project Description",
  "price": 1000, // This price MUST be in cents.
  "connectedStripeAccount": "Stripe Connected Account ID", // Check out the Stripe Connect documentation to understand what is a connected account: https://stripe.com/docs/connect/collect-then-transfer-guide?platform=web
  "project_id": "Project ID"
}
route.ts
import Stripe from "stripe";

const stripe = new Stripe(process.env.STRIPE_SECRET_KEY as string, {
  apiVersion: "2023-08-16",
});

import { NextRequest, NextResponse } from "next/server";
import { createProductAndPrice } from "@/app/project/components/PurchaseMethods/utils/stripe/createProductAndPrice";

interface Payload {
  name: string;
  icon: string;
  description: string;
  price: number;
  connectedStripeAccount: string;
  project_id: string;
}

export async function POST(req: NextRequest) {
  const body = (await req.json()) as Payload;

  const purchaseAmountInCents = body.price ? Number(body.price) * 100 : 0;

  const productAndPrice = await createProductAndPrice(
    body.price,
    body.name,
    body.icon,
    body.description ?? "This product does not have a description."
  );

  try {
    const session = await stripe.checkout.sessions.create({
      payment_method_types: ["card"],
      line_items: [
        {
          price: productAndPrice.price.id,
          quantity: 1,
        },
      ],
      payment_intent_data: {
        transfer_data: {
          destination: body.connectedStripeAccount,
          amount: (purchaseAmountInCents * 50) / 100, // This will create a 50/50 split payment
        },
      },
      mode: "payment",
      success_url: `${req.headers.get("origin")}/checkout/success?project=${
        body.project_id
      }`,
      cancel_url: `${req.headers.get("origin")}/`,
    });

    return NextResponse.json({ sessionId: session.id }, { status: 200 });
  } catch (error) {
    console.error(error);
    return new Response("Error while creating the split payment intent.", {
      status: 500,
    });
  }
}