Find all the information about chargeback in e-commerce here:
The merchant identification number (MID) can be used to credit a payment by credit card to the relevant merchant who accepted the payment. The MID is transferred from the acquirer to the dealer. Mostly it is a MID that is valid for Visa or Mastercard or in combination. For example, if a customer makes a payment with a Visa card, the MID can identify the company's credit card acceptance contract.
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