REST API | American Express

Custom Fields

Use this window to add, edit, or delete custom fields. You can define a maximum of 100 custom fields for information specific to your business. When creating custom rules, you can use these fields as additional order elements.
The MDD column contains the number of the merchant-defined field. The Type column contains the data type for the field.
You can delete custom fields even if they are used in custom rules or velocity rules. However, if you delete custom fields, your rules may not work as intended.
WARNING
Custom lists, rules, and fields are not intended to and must not be used to capture personally identifying information. Accordingly, merchants are prohibited from capturing, obtaining, and/or transmitting any personally identifying information in or via custom lists, rules, or fields. Personally identifying information includes, but is not limited to, address, credit card number, social security number, driver's license number, state-issued identification number, passport number, and card verification numbers (CVV, CVC2, CVV2, CID, CVN). In the event it is discovered that a merchant is capturing and/or transmitting personally identifying information via custom lists, rules, or fields, whether or not intentionally, the merchant's account is immediately suspended, which results in a rejection of any and all transaction requests submitted by the merchant after the point of suspension.
If you belong to a group of merchants
: You can view the custom fields but only your group administrator can create or delete them. If you are added to a group of merchants after you create custom fields, your custom fields are replaced with the group’s custom fields. The background color of the row distinguishes merchant and group fields.