Terminal ID number (TID)

A terminal ID number, also called a “terminal identification number” or “TID,” is an eight-digit alphanumeric code financial institutions utilize to track and identify the terminal used for processing a transaction. The TID also facilitates swift retrieval of transactions by merchants in case of refunds or disputes.

It is important to distinguish the terminal ID number from your merchant ID number (MID), as the TID is unique to each specific point-of-sale terminal. Its purpose is to identify the origin of a transaction in relation to your particular payment system. This code, consisting of eight characters, helps your bank, terminal provider, and payment network recognize your POS terminal, the software being utilized, and the location and status of your hardware.

Each terminal ID is distinct, and no two terminals share the same number. Whether it’s the main operating terminal in a retail store, pay-at-the-table remote readers, contactless terminals, or swiping stations, every terminal is assigned its own unique terminal ID.

Payment processors assign a Terminal ID Number (TID) as a special code to each transaction, ensuring its unique identification. This set of digits allows merchant service providers to monitor and identify specific payments in case of any issues. Moreover, banks and payment platforms can maintain records of transaction volumes at any given moment by utilizing TIDs.

TIDs are vital in enhancing security measures for retailers, controllers, acquiring banks, and card companies. They are an essential security feature since they are printed on every transaction activity.