Two mobile phone held next to one another; one shows a transaction amount; the other shows a Discover card in a digital wallet.

How Does Credit Card Processing Work?

5 min read
Published September 23, 2025

Key Takeaways

  1. Credit card processing is complex and involves multiple parties, including the merchant bank, payment processor, and credit card network.
  2. After you swipe your card, the merchant bank transfers the transaction information to your credit card company to approve or deny the purchase.
  3. If you don’t have enough available credit, your transaction may be declined.

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