UDF guidelines
Use these guidelines when working with User Defined Fields (UDFs) in authorizations.
When you are creating an authorization request, it might include UDFs. The names and locations of UDFs vary based on your administrator’s UDF configurations.
UDFs that require a value are marked with an asterisk. You must provide a value to continue creating the authorization (move to the next screen or submit an authorization).
The following example, shows an IP authorization with a required UDF.