问题
Im Implementing PayPal's Client Side REST implementation for Express Checkout: https://developer.paypal.com/docs/integration/direct/express-checkout/integration-jsv4/client-side-REST-integration/
How does anyone know what the field is where you pass them a transaction or reference ID that they will then return via the? https://developer.paypal.com/docs/api/payments/
Tried transaction.reference_id, and the invoice_number fields. No luck.
回答1:
If anyone else is wondering you can make use of the 'custom' parameter bound to each transaction object.
来源：https://stackoverflow.com/questions/46320753/paypal-express-checkout-pass-transactionid