EP01 · Plastic Surgery

How credit cards
actually work.

Follow one $100 purchase from “approved” to the store’s payout, then to Penny’s monthly bill. The store getting paid and Penny repaying her bank are two different things.

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Updated November 1, 2026 · General financial education

What did “approved” actually do?

Penny taps her card, sees an approval and leaves with her bag. That approval is the issuing bank’s answer to a request: can this purchase go ahead? It does not, by itself, tell us that the store can already use its payout. Penny also still has to repay the bank providing her credit.

For this example, we are following a U.S.-issued credit card at a U.S. store, on a network such as Visa or Mastercard.

The request and the money take different steps

  1. Authorization: the request passes through the merchant side and card network to Penny’s issuer. The answer returns to the store.
  2. Clearing and settlement: after the store submits the sale, the parties exchange the completed details and settle the amounts owed between them.
  3. Merchant payout: the store receives funds under its provider’s payout arrangement. Availability varies; there is no universal waiting period in this explanation.
  4. Cardholder repayment: Penny later pays her own bank. The store normally receives its funds before that monthly card payment.

Pending, posted and paid

A pending purchase has been authorized but is still processing. It can already reduce available credit. Its final amount can change, for example when a restaurant adds a tip. Once posted, it is part of the account balance. In Penny’s example, she still owes it: posted does not mean she has paid it off.

Why can the store get less than $100?

Our price example is Square Free’s published U.S. tap, dip or swipe rate for a U.S.-issued card: 2.6% plus 15 cents, checked November 1, 2026. We assume no add-on fees.

One $100 sale

$100 × 2.6% + $0.15 = $2.75 processing fee

$100 − $2.75 = $97.25 for the store

Before the store’s other costs. Penny still owes her bank $100. Other providers, plans and payment types can charge different prices.

The whole fee does not go to Visa or Mastercard. Interchange generally goes from the acquirer to the issuer; network and provider costs are other parts of merchant pricing. Square’s published merchant price does not establish the exact private split. We do not assign an invented dollar amount to each participant.

Her statement is a snapshot

To keep the example simple, this is Penny’s only charge, with no previous balance, other activity or fees. At cycle close, her statement balance is $100. Later activity may change the current balance in her app, but it does not rewrite that earlier statement.

The statement also gives a minimum payment and a due date. Paying at least the required minimum on time meets that bill’s payment requirement. It does not guarantee avoiding interest. If the example minimum is $25 and that is all she pays, $75 of the modeled purchase remains. The $25 is illustrative, not a quoted minimum for your card.

Full payment and purchase grace

Many cards offer a purchase grace period between the end of the billing cycle and the payment due date. Penny’s card offers one, and her account is eligible in our example. Under those conditions, paying her full $100 statement balance by the due date avoids purchase interest on this bill.

If the full statement balance is not paid on time, purchase grace can be lost. Earlier balances can affect eligibility, and new purchases can then accrue interest from their purchase dates. Getting grace back depends on the agreement; one full payment will not necessarily restore it immediately. Cash advances generally follow different rules.

What does APR look like for one day?

Penny has already repaid our purchase. For this separate calculation, imagine an unchanged, interest-bearing $100 balance at a made-up 25% annual percentage rate, or APR.

0.25 ÷ 365 × $100 ≈ $0.06849

About 7 cents for one day.

This illustration uses 365 days. Actual charges depend on the issuer’s method, balances, payments and terms. It is not a monthly estimate or a charge added to Penny’s repaid purchase.

Autopay still has an amount and a date

Autopay may be set to a minimum, the statement balance or another amount. “On” does not tell Penny which amount is scheduled. She checks the amount and date together, makes sure funds are available, and looks at her issuer’s terms. The payment must process successfully on time, and autopay does not change purchase-grace conditions.

This is general financial education, not individualized financial advice or a product recommendation. Your card agreement and provider terms govern. The episode and this article use AI assistance in writing and production, including ElevenLabs narration and some AI-generated visuals, with human creative direction and editorial review.