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Merchant Account Glossary: MID and TID

Merchant ID (MID)

MID stands for the unique number assigned to a merchant and identifies the merchant to an ISO (independent sales organization or reseller), acquiring bank or third party processor.

Terminal ID (TID)

This is the number assigned to a credit card transaction device (ie: POS terminal or Virtual Terminal).

It identifies the merchant's physical equipment, gateway or software to the processor and bankcard data transport networks.

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