Merchant Identification Number (MID)

Merchant Identification Number (MID)

Your merchant identification number (MID) is your business’s unique identifier with your merchant account provider and is used in all dealings you have with them. This e-guide provides basic information about MIDs that every business owner should know.

Before you can start accepting credit cards, debit cards and other types of payment cards, you must establish a merchant account with a processor like TransFirst®, which has been in the business of electronic payments processing since 1995. We offer a full line of processing solutions — including POS retail, Internet, wireless and mobile — and we are dedicated to bringing state-of-the-art technology, personalized customer service and cost-effective pricing to all our clients.

Now, get ready to learn more about the role of the MID by downloading our free e-guide on the subject.


Get Started Below

or Call 888.845.9457
Do you accept credit cards?
Are you a U.S.-based business?
What is your primary method of processing?
  • Your information is private and secure. We only accept U.S.-based businesses. We do not accept adult businesses


satisfied merchants, partners and vendors
See What Others Are Saying


Chat with a Professional!

Your information is private
and secure.We only
accept U.S.-based
businesses. We do not
accept adult businesses.

© 2017 Total System Services, Inc.®

All rights reserved worldwide. TSYS® and TransFirst® are
federally-registered U.S. service marks of Total System Services, Inc. TransFirst is a registered ISO/MSP of: Wells Fargo Bank, N.A., Walnut Creek, CA; Synovus Bank, Columbus, GA; and Deutsche Bank, New York, NY; for Visa® and MasterCard® transactions only. TSYS Merchant Solutions is a registered ISO/MSP of Wells Fargo Bank, N.A., Walnut Creek, CA and Synovus Bank, Columbus, GA.