Getting Started with UnionPay International Developer
1 Introduction
2 Account Operation
3 Order Operation
4 API Sandbox Testing Operation
Support 
Documentation
Documentation 4.3 Calling of API
(1) Taking Postman as an example of testing instruments, calling of API needs to specify testing URL and access method, and fill in request parameters. Testing URL shall refer to test URL of each API on the interface of My Test. Access method and request parameters shall refer to the parameter introduction to the designated API and testing parameters of API services;
(2) Click Send to initiate request. The response message of API calls is displayed in Postman as follows:
Specific meaning of response codes in response messages need to refer to the illustration on answer-back codes of each API service.
On the interface of Test Analysis, users can view the sandbox test of different APIs in a specified time period, with details as follows:
Kindly Reminder