Creates a new checkout session without creating a Payment Intent, intended for deferred payment intent flows. Uses the merchant's secret API key for authentication/authorization but does not persist it in checkout-api-go.

Recommended for new integrations: future features are only supported on v2. It currently supports pass-on fees.

{
  "data": {
    "attributes": {
      "capture_type": "manual"
    }
  }
}

{
  "data": {
    "attributes": {
      "checkout_url": "https://checkout.paymongo.com/xxx"
    }
  }
}