# MID (merchant ID)

https://www.uniwebpay.com/glossary/mid/

*Last updated: 2026-08-03*

The number identifying a merchant account to the acquirer and the schemes. A business can have more than one — commonly one per outlet, or per channel — and how they are arranged decides whether reporting arrives combined or separately. It is the reference to quote when contacting a provider about anything account-level.

## Why it matters to a merchant

The number to have to hand before calling anybody about anything account-level, and the number whose arrangement quietly decides what your reporting looks like. A business with several outlets should ask deliberately whether it wants one per outlet or one across all of them — that choice is easy to make at setup and awkward to change once a year of reporting exists in the other shape.

## Related terms

*At the counter*

- [Card present / card not present](https://www.uniwebpay.com/glossary/card-present/)
- [EMV](https://www.uniwebpay.com/glossary/emv/)
- [Contactless](https://www.uniwebpay.com/glossary/contactless/)
- [Merchant-presented QR / consumer-presented QR](https://www.uniwebpay.com/glossary/merchant-presented-qr/)
- [Smart terminal](https://www.uniwebpay.com/glossary/smart-terminal/)
- [MCC (merchant category code)](https://www.uniwebpay.com/glossary/mcc/)
- [Magnetic stripe](https://www.uniwebpay.com/glossary/magnetic-stripe/)
- [Consumer-presented QR](https://www.uniwebpay.com/glossary/consumer-presented-qr/)
- [Tap to phone (SoftPOS)](https://www.uniwebpay.com/glossary/tap-to-phone/)
- [CVM (cardholder verification method)](https://www.uniwebpay.com/glossary/cvm/)
- [Tip adjust](https://www.uniwebpay.com/glossary/tip-adjust/)

- [All 74 terms](https://www.uniwebpay.com/glossary/)

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