MID (Merchant Identification Number)
The unique identifier assigned to each merchant by a payment processor. The unit of measurement for portfolio size.
Full definition
A Merchant Identification Number (MID) is the unique identifier a payment processor assigns to each merchant account. Portfolio size and value in M&A is often discussed in terms of MID count alongside net monthly residual. Active MIDs (those actually processing) are what matters for valuation, as opposed to total or churned MIDs.
Related terms
A third-party company authorized to sell or lease payment processing services on behalf of a sponsoring bank or processor.
The collection of merchant accounts a payments company processes for, valued for sale based on the income stream they generate.
A company that aggregates sub-merchants under its own master merchant account, taking on underwriting and compliance to enable instant onboarding.
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