What happens when you swipe or tap your card
When you hand over your credit card or tap it at a terminal, the merchant's payment processor doesn't instantly pull money from your bank account. Instead, a chain of four separate organisations passes information back and forth in seconds: your card issuer (your bank), the merchant's acquiring bank, a card network like Visa or Mastercard, and the payment processor sitting between them. The merchant gets a temporary authorisation that the transaction is legitimate, you see a charge appear on your statement days later, and the actual money moves in a separate batch settlement that happens overnight or the next business day.
The speed you see—the receipt printing in seconds—is the authorisation step only. The money itself travels on a slower track. Understanding this gap matters because it explains why a declined card still shows a temporary hold, why refunds take longer than charges, and why a merchant can't instantly reverse a transaction you regret.
Key Takeaways
- Authorisation (the yes/no decision) happens in seconds, but settlement (the actual money movement) happens in a separate batch process overnight or the next day.
- Your card issuer checks your available credit and fraud signals; the acquiring bank checks the merchant; the card network routes the message between them.
- A temporary hold can appear on your account even if the transaction is later declined, because the issuer reserves the funds during authorisation.
- Refunds take longer than charges because they reverse through the same chain in the opposite direction and depend on the merchant initiating the reversal.
- Interchange fees (what the merchant pays your bank) are set by the card network and vary by card type, merchant category, and transaction size.
The four players and what each one checks
Your card issuer is the bank that issued your card to you. When you swipe, they receive a message asking: "Does this person have available credit? Is this transaction consistent with their usual spending? Is the card reported stolen?" They respond with an authorisation code (yes) or a decline (no) in about one second. They are not moving money yet—they are just reserving the available credit so you cannot spend it twice.
The merchant's acquiring bank is the bank that signed up the merchant to accept cards. They verify that the merchant exists, that their account is in good standing, and that the transaction amount is within normal limits for that business. A coffee shop processing a $5,000 charge would trigger a review here, for example.
The card network—Visa, Mastercard, American Express, Discover—owns the rails. They set the rules for what information travels, the fees each party pays, and the timeline for settlement. They do not hold your money or the merchant's money; they are the traffic controller.
The payment processor is the software and service that connects the merchant's point-of-sale system to the acquiring bank and card network. They format the message, route it, and log it. Many small merchants never see this layer because their payment terminal or online checkout handles it invisibly.
Authorisation versus settlement: why the timing matters
Authorisation is the real-time check. Your issuer says yes or no within seconds. If yes, they place a hold on your available credit for the authorised amount. This hold is temporary—it lasts until settlement happens or until it expires (usually three to seven days). During this time, the money is not gone from your account, but you cannot spend it elsewhere.
Settlement is the batch process that moves actual money. At the end of each business day, the merchant's acquiring bank collects all the authorised transactions from that day, groups them by card network, and sends them to the networks. The networks then send them to each card issuer. Your issuer removes the hold and posts a real charge to your account. Simultaneously, your issuer sends the funds to the acquiring bank, which deposits them into the merchant's account. This whole process typically completes overnight, though some transactions settle the next business day depending on timing and the merchant's bank.
This is why a refund takes longer than a charge: the merchant must initiate a reversal message that travels back through the same chain. If you ask for a refund on Friday evening, the merchant may not process it until Monday, and it may not reach your issuer until Tuesday or Wednesday. Your issuer then removes the charge and credits your account, which can take another one to three business days depending on your bank.
How holds work and why they can confuse your balance
When a transaction is authorised, your issuer places a hold on your available credit. Your account shows two balances: your current balance (what you have already been charged for) and your available credit (current balance minus holds). If you have a $5,000 credit limit, a current balance of $2,000, and a $500 hold from a gas station, your available credit is $2,500, not $3,000.
Holds expire automatically if the merchant does not settle the transaction. A hold from a hotel reservation might last seven days; a hold from a restaurant might last three days. Once the hold expires, the available credit returns to your account. However, if the merchant does settle (which they usually do), the hold converts to a real charge and the available credit stays gone until you pay your bill.
Some merchants place larger holds than the final charge—hotels and rental car companies do this routinely to cover potential incidentals. The hold might be $200, but the final charge might be $150. The extra $50 hold expires within a few days, and your available credit returns. This is not fraud; it is a standard practice disclosed in the merchant's terms.
Interchange fees and why merchants pay different rates
Every time you use a credit card, the merchant pays a fee to your card issuer. This fee is called the interchange fee, and it is set by the card network (Visa or Mastercard), not by your bank or the merchant. The merchant's acquiring bank collects this fee and passes it to your issuer.
Interchange rates vary based on three main factors: the card type (a rewards card costs more than a basic card), the merchant category (grocery stores pay less than restaurants, which pay less than gas stations), and the transaction size (very large transactions sometimes have different rates). Visa and Mastercard publish their interchange schedules, which run dozens of pages and change several times per year. A typical range is 1.5% to 3.5% of the transaction amount, though some categories fall outside this range.
The merchant does not negotiate interchange rates directly—those are set by the networks. What merchants can negotiate is the markup their acquiring bank adds on top of interchange, plus any flat fees per transaction. This is why a small business might pay 2.9% plus $0.30 per transaction, while a large retailer might pay 1.8% plus $0.15.
What happens when a transaction is declined
A decline can happen at authorisation (real-time) or at settlement (the next day). A real-time decline means your issuer said no—insufficient credit, suspected fraud, or a card reported stolen. You find out immediately at the checkout. No hold is placed, and no charge appears on your account.
A settlement decline is rarer but more confusing. The transaction was authorised and a hold was placed, but when the merchant tried to settle it the next day, your issuer rejected it. This can happen if your credit limit dropped between authorisation and settlement, or if your issuer's fraud team flagged it after the initial check. The hold expires within a few days, and the charge never posts to your account. You may see the hold disappear without ever seeing a charge.
If a merchant receives a decline at settlement, they cannot automatically retry it. They must contact you and ask for a different payment method or reauthorise the transaction. Some merchants do this automatically (subscription services, for example), but most do not.
Fraud protection and chargebacks
Your card issuer monitors transactions in real-time for fraud signals: unusual location, unusual merchant category, unusually large amount, rapid-fire transactions. If a transaction looks suspicious, the issuer can decline it at authorisation. You can also report a transaction as fraudulent after the fact, which triggers a chargeback process.
A chargeback is a formal dispute. You tell your issuer the transaction was unauthorised or the merchant failed to deliver. Your issuer reverses the charge immediately (you see the credit within one to three business days) and then disputes it with the merchant's acquiring bank. The acquiring bank has a window (usually 10 to 20 days) to respond with evidence that the transaction was legitimate. If they cannot, your issuer keeps the money and the merchant loses it. If they can prove legitimacy, the charge is reinstated on your account.
Merchants lose money on chargebacks in two ways: they lose the sale amount, and they pay a chargeback fee (typically $15 to $100 per dispute). Repeated chargebacks can get a merchant flagged by their acquiring bank or even kicked off the payment network entirely.
Frequently Asked Questions
Why does my available credit not update immediately after I make a purchase?
Your issuer places a hold on your available credit at authorisation, which happens in seconds. However, the hold does not convert to a real charge until settlement, which happens overnight or the next business day. Your available credit updates immediately, but your current balance does not update until settlement completes. Some banks show both the hold and the pending charge separately; others combine them.
Can a merchant charge my card twice by accident?
It is possible but rare. If a merchant's system crashes during settlement, they might resubmit the same transaction, creating a duplicate charge. Your issuer's fraud detection may catch this, but not always. If you spot a duplicate, report it to your issuer as a billing error. They will investigate and reverse the duplicate charge if confirmed.
What does "pending" mean on my credit card statement?
Pending means the transaction has been authorised and a hold has been placed, but settlement has not yet completed. The charge will post to your account (become final) within one to three business days. Pending transactions count against your available credit but not your current balance.
Why do some merchants ask for my zip code or CVV?
These are fraud-prevention tools. Your zip code is verified against your issuer's records; your CVV (the three-digit code on the back) proves you have the physical card. Online merchants cannot see your full card number, so the CVV adds a layer of verification. These checks happen during authorisation and can cause a decline if they do not match.
If I dispute a charge, when do I get my money back?
Your issuer typically credits your account within one to three business days after you file a dispute, even before the investigation is complete. The formal chargeback process takes 10 to 20 days. If the merchant proves the transaction was legitimate, the charge is reinstated on your account, and you will owe it again.