Glossary

Merchant ID

Identifier of the seller's account with the acquirer, used to group the history of transactions, disputes, and risk.

The Merchant ID, or MID, is the number that identifies your operation within the acquirer. The entire history hangs off it: volume, approval, disputes, and complaints.

It's the MID that gets monitored, and it's the MID that gets closed when the indicators go past the limit. That's why opening another account after a block rarely works: the link between document, domain, and product usually rebuilds the connection to the previous MID.

Documentation exists so a seller never learns a rule on the day it costs them. Worth reading before you need it.
Wellington CostaGlobal Payments Specialist

Need to deal with merchant id in practice?

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Written by Wellington Costa Global Payments Specialist

Writes about payment infrastructure, checkout conversion and chargeback reduction. Works directly with digital product sellers, affiliates and creators selling to more than 40 countries through Mundpay.