Typically the interchange fee is a percentage of each transaction, the amount varies to cover various costs based on factors such as:

• Transaction type: Card-Present | Card-Not-Present | Online | POS
  Interchange fees for card-not-present transactions are significantly higher than those for card present.
  The risk of fraud is higher when merchants cannot see their consumers' cards.
• Business industry category: The MCC
  A business’ MCC can have an impact on its interchange fees, as higher risk businesses usually have higher interchange fees.
• Card type: Debit | Credit | Commercial
  Interchange fees for credit cards are higher than for debit cards.
• Transaction location:
  Interchange fees vary depending on the country where the transactions occur.
  For example, Interchange fees in European countries are lower than in North America.
  For consumer card transactions within the European Economic Area (EEA), interchange fees are capped at:
  • • 0.3% of the transaction for credit cards
    • 0.2% of the transaction for debit cards