Identifies the clerk executing this transaction.
This contains a merchant-generated code used to identify an individual clerk in the merchant's system. Each clerk within a merchant's location should have their own unique identifier, to help determine which employee has performed operations on a gift card. This may be a maximum of 8 characters in length, and may only contain alphanumeric data. This can be used in conjunction with the TerminalId to determine the location a transaction was made and the employee who made it.