HitPay for Vercel

import {
  getToken,
  startAuthorization,
  UserAuthorizationRequiredError,
} from "@vercel/connect";

const CONNECTOR = "api.hit-pay.com/hitpay"; // the connector UID shown in Vercel

export async function hitpayToken(userId: string, returnUrl: string) {
  const subject = { type: "user" as const, id: userId };
  try {
    return { token: await getToken(CONNECTOR, { subject }) };
  } catch (err) {
    if (err instanceof UserAuthorizationRequiredError) {
      const { url } = await startAuthorization(CONNECTOR, { subject }, { callbackUrl: returnUrl });
      return { authorizeUrl: url };
    }
    throw err;
  }
}

export async function POST(request: Request) {
  const base = process.env.HITPAY_API_BASE ?? "https://api.hit-pay.com";
  // Vercel Connect: const { token } = await hitpayToken(userId, returnUrl);
  const token = process.env.HITPAY_ACCESS_TOKEN;
  const origin = new URL(request.url).origin;

  const res = await fetch(`${base}/v1/payment-requests`, {
    method: "POST",
    headers: {
      Authorization: `Bearer ${token}`,
      "Content-Type": "application/x-www-form-urlencoded",
    },
    body: new URLSearchParams({
      amount: "25.00",
      currency: "SGD",
      reference_number: "order-123",
      redirect_url: `${origin}/checkout/complete`,
    }),
  });

  const { id, url } = await res.json();
  // Store `id` with your order, then send the customer to `url`.
  return Response.json({ id, url });
}