How to start

1. Apply for Merchant Id and Key#

1.1 Complete registration in the OnlinePay Merchant
1.2 Login to the OnlinePay Merchant, go to Personal Centre - User Management - Personal Information, and obtain the PrivateKey

2 Parameter signature#

2.1 Depending on the payment method, confirm the interface used
2.2 If the sign parameter of the interface is MD5(A+B+C+PrivateKey)
2.3 The MD5 value generated by MD5(A+B+C+PrivateKey) will be converted to all upper case and the result will be the value of the sign

3. Calling the payment interface#

Call the interface using the restful method

4. Refund#

When a customer needs a refund, they can call the Refund interface