Create a payment for an order

The payment gateway payload for the order, returned as the response body itself — the same object the order responses expose as pg_payment_info. Manual methods such as bank_transfer and cod return an empty object. Virtual account methods expose provider reference and account details under the provider's payment_method object. QRIS responses expose QR data or a QR image payload. E-wallet, card, and invoice methods may expose provider actions or hosted provider URLs. SingaPay payments use normalized keys such as payment_gateway, payment_url, deeplink_url, qr_string, qr_image_url, va_number, and va_name. Order-level fields (public_order_url, payment_url, redirect_url, payment_method) are not part of this body; read them from the order responses.