Request/Response Header 
Attention
HTTP headers are case-insensitive. When obtaining response header information, you need to pay attention to whether the library you are using performs special processing on upper and lower case.
When successfully requesting/responding to interface messages, the following HTTP header information needs to be carried.
- V-Api-Key
 
Merchant API KEY assigned by the system.
- V-Api-Version
 
The interface version used is currently defaulted to 1
- V-Timestamp
 
The second level timestamp of the request/response, consistent with the signature timestamp
- V-Nonce-Str
 
Signature random string, different from signature nonce_ Str remains consistent.
- V-Signature
 
Base64 encoded request/response signature.
