Merchant APP ID (Alphanumeric - Length of 32 chars and special chars $@%#)

Merchant APP KEY (Alphanumeric - Length of 32 chars and special chars $@%#)

EPI is an end point identifier, Identify the device on valor infrastructure, it's a 10 digit number starts with 2

Txn type should be "listsubscription"

Subscription id (length of max 11 chars)

Subscription start date MM/DD/YYYY