Merchant-defined Fields (MDF) are a great option for merchants to add their own custom fields. Merchants can add verification fields, terms of service agreement fields, various data that apply to their business transactions, and much more. Merchants can configure up to 20 custom fields, which can be changed, added, and de-labeled at any time. They can be used with the API, QuickClick, Collect Checkout, Virtual Terminal, iProcess, Recurring, Webhooks, and Swipe Software.
https://support.nmi.com/hc/en-gb/articles/360002718417-Merchant-Defined-Fields
PLEASE NOTE: NMI and Allied Payments Gateway Are The Same
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