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

Transaction type should be 'updateDiscount'

Unique identifier of the discount.

Discount name should be allowed max 25 chars

Discount amount to be applied to the transaction. Must be provided as a currency amount in USD (e.g., 10.00).