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💳 How do credit cards work?

Follow a card purchase from instant authorization to settlement and a monthly bill, then see how grace periods, APR, payments, credit reporting, and disputes change its cost.

3
lessons
~10 min
to learn
🤖 Technology
subject
Adults
level
Start the course →

What you’ll learn

  1. What happens at the terminalDistinguish a credit card from stored money and trace authorization through the merchant, acquirer, network, and issuer.A card presents account credentials; the issuer extends credit and returns the approval, while the network connects the two bank sides.
  2. From purchase to monthly billExplain the difference between authorization, clearing, settlement, posting, the billing cycle, and daily interest calculation.A purchase moves from pending permission to a posted balance, then joins a statement whose unpaid amount can accrue interest under the agreement.
  3. Choose what the card costs youCompare payment choices, explain grace periods and minimum payments, and identify credit-reporting and dispute consequences.Paying in full can preserve an eligible purchase grace period; minimum-only repayment can be slow, while prompt statement review protects both credit and dispute rights.

Questions this course answers

What has happened when a terminal first displays APPROVED?

Authorization is the issuer's approval for the purchase to proceed; clearing, settlement, posting, and billing follow.

Put the main stages of a credit-card purchase in order.

The quick approval comes first; final data, bank settlement, posting, and periodic billing follow.

Match each statement term with what it means.

These figures answer different questions about timing, obligation, and borrowing cost.

Why can paying the minimum on time still make a credit-card purchase expensive?

On-time status and low total cost are separate goals; paying more reduces the interest-bearing balance sooner.

Grounded in trusted sources

  • Office of the Comptroller of the Currency, Merchant Processing, Comptroller's Handbook, Version 1.0, pp. 7–12, https://www.occ.treas.gov/publications-and-resources/publications/comptrollers-handbook/files/merchant-processing/pub-ch-merchant-processing.pdf
  • Consumer Financial Protection Bureau, What is a grace period for a credit card?, reviewed September 23, 2024, https://www.consumerfinance.gov/ask-cfpb/what-is-a-grace-period-for-a-credit-card-en-47/
  • Consumer Financial Protection Bureau, How does my credit card company calculate the amount of interest I owe?, reviewed January 22, 2024, https://www.consumerfinance.gov/ask-cfpb/how-does-my-credit-card-company-calculate-the-amount-of-interest-i-owe-en-51/
  • Consumer Financial Protection Bureau, What is a daily periodic rate on a credit card?, reviewed September 23, 2024, https://www.consumerfinance.gov/ask-cfpb/what-is-a-daily-periodic-rate-on-a-credit-card-en-46/
  • Consumer Financial Protection Bureau, A box on my credit card bill says that I will pay off the balance in three years..., modified February 2, 2024, https://www.consumerfinance.gov/ask-cfpb/a-box-on-my-credit-card-bill-says-that-i-will-pay-off-the-balance-in-three-years-if-i-pay-that-much-and-make-new-purchases-will-i-still-owe-nothing-after-three-years-en-36/
  • Consumer Financial Protection Bureau, Am I responsible for unauthorized charges if my credit cards are lost or stolen?, reviewed April 15, 2024, https://www.consumerfinance.gov/ask-cfpb/am-i-responsible-for-unauthorized-charges-if-my-credit-cards-are-lost-or-stolen-en-29/
  • Federal Trade Commission, Using Credit Cards and Disputing Charges, accessed August 14, 2026, https://consumer.ftc.gov/articles/using-credit-cards-and-disputing-charges
  • Consumer Financial Protection Bureau, Will paying off my credit card balance every month improve my credit score?, reviewed January 29, 2024, https://www.consumerfinance.gov/ask-cfpb/will-paying-off-my-credit-card-balance-every-month-improve-my-score-en-1293/

Every Wunder lesson is built from real, reputable sources — never invented.

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