Merchant Identifier — the unique number assigned to a merchant account so the networks and processor can identify where funds should go. A business may hold several MIDs across locations or channels.
Why it matters for your business
Terms like MID aren't just jargon — they sit behind what you actually pay to accept payments. Understanding them is the difference between reading your statement and being at the mercy of it. If you're not sure how this shows up in your own costs, the fastest way to find out is to have someone read your statement line by line.
See what you're really paying →Related — Processing & Technology