MDR Full Form : Know about MDR Full Form in Bank, Medical, Computer and more! The MDR full form is Merchant Discount Rate. It is a fee charged by banks to merchants for processing transactions. This fee is typically a percentage of the total transaction amount and is used to cover the costs associated with processing payments. MDR is the fee charged to a merchant for processing debit and credit card transactions. Learn how MDR works, its components, and its importance for e-commerce and payment processing. Get MDR full form and full name in details. Visit to know long meaning of MDR acronym and abbreviations. It is one of the best place for finding expanded names. MDR stands for Merchant Discount Rate and is the fee charged by payment service providers for accepting card and online payments. Learn about MDR charges, PSP fees, interchange fees and how to negotiate them for your business.