CUSTOMER DEFINED DATA
This code steps you through an optional process of collecting and passing information that’s not required for credit card processing but you need for your own purposes. This data is typically collected when you’re processing transactions or storing payment methods.
This data can be entered by your customers or you may provide this customer-specific data. For example, customers could enter their names or you could attach an identification number that supports a process. Some fields are identified (e.g. phone number) and other fields may be tailored to support your specific requirements (e.g. Custom ID1).