A merchant ID number is a 15 digit unique identification number assigned to the business entity when they open a merchant account.
This number is used to determine a merchant who is tackling to process the transaction to both the processing company and the customerâs bank.
This unique identifier is the reason sales are made by a given merchant.
This identifier may eventually lead to money being transferred from the cardholderâs bank to the merchantâs bank account.
Without a merchant ID number, the card-issuing bank wouldnât be able to know where to send the money.Â