ACH Recurring Postpone Payment

Merchant APP ID (Alphanumeric - Length of 32 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 must be achpostponepayment

Reference Number for the ACH sale API