Merchant APP ID (Alphanumeric - Length of 32 chars)
Merchant APP Key (Alphanumeric - Length of 32 chars)
EPI is an end point identifier, Identify the device on valor infrastructure, it's a 10 digit number starts with 2
Transaction type should be set as 'vc_publish'
Channel ID (Alphanumeric - Length of 32 chars)
ISV Certificate ID
Ignore the 'Transaction is already in a processing state' message and set the version to 2
200