What Adyen is and what it does

Adyen is a payment processor that moves money from a customer's card or bank account to a merchant's account. It sits between the two parties, handling the technical work of checking whether the payment is valid, whether the customer has enough funds, and whether the transaction should be approved or declined. Adyen does not hold the money itself — it passes the funds through to the merchant's bank within one to three business days.

Adyen operates globally and handles payments in over 150 currencies. It works with credit cards, debit cards, digital wallets like Apple Pay and Google Pay, bank transfers, and regional payment methods such as iDEAL in the Netherlands or Alipay in China. The company is publicly traded and is one of the largest independent payment processors in the world, meaning it is not owned by a bank or card network.

Most customers never see Adyen's name. You encounter it when you check out on a website or app that uses Adyen behind the scenes. The merchant chose Adyen to handle the payment flow, but the experience feels like you are paying the merchant directly.

Key Takeaways

  • Adyen is a payment processor that merchants use to accept card payments, digital wallets, and bank transfers from customers worldwide.
  • When you pay through Adyen, your payment information is encrypted and routed through card networks and banks, not stored by Adyen itself.
  • Adyen charges merchants a fee per transaction, typically a percentage of the sale plus a fixed amount, though the customer does not see this fee.
  • Funds from your payment reach the merchant's bank account within one to three business days, depending on the payment method and the merchant's bank.
  • Adyen handles fraud detection and dispute resolution, so if you contest a charge, Adyen manages the process between you, your bank, and the merchant.

How a payment flows through Adyen's system

When you enter your card details or select a digital wallet at checkout, the merchant's website or app sends that information to Adyen's servers. Adyen encrypts the data when ready — your card number is never stored on the merchant's own computers. Adyen then sends the encrypted payment to the relevant card network (Visa, Mastercard, American Express) or directly to your bank if you are using a bank transfer.

The card network or bank checks whether the card is valid, whether it is not reported stolen, and whether your account has sufficient funds. This check typically takes one to three seconds. The network or bank sends back an approval or decline code to Adyen, which displays the result to you on the screen. If approved, Adyen records the transaction and notifies the merchant that the payment succeeded.

The actual movement of money happens separately. Your bank deducts the amount from your account when ready or within one business day. The merchant's bank receives the funds from Adyen within one to three business days, depending on the payment method and the banks involved. During this window, Adyen holds the money in a settlement account — it is not Adyen's money to keep, but rather in transit.

What information Adyen collects and how it is protected

Adyen collects your card number, expiration date, and CVV (the three-digit security code on the back) at the moment of payment. It also records the transaction amount, the merchant's name, the date and time, and your IP address. If you use a digital wallet or bank transfer, Adyen collects less sensitive data — usually just a token or reference number that your wallet or bank provides, rather than your actual card or account number.

Adyen is PCI DSS Level 1 certified, which is the highest security standard for payment processors. This means it undergoes annual audits by independent firms to verify that it encrypts data, restricts access to card information, and maintains find networks. Your card details are encrypted the moment they enter Adyen's system and are never stored in plain text. Adyen also uses tokenization — after your first payment, it can store a token (a random string of characters) that represents your card, so you do not have to enter your full card number again on future purchases.

Adyen does not sell your payment information to third parties. It shares data with your bank and the card network only as needed to process the payment, and it shares data with the merchant only after the transaction is complete — typically just a confirmation that the payment went through, not your full card number.

Fees Adyen charges and who pays them

Adyen charges merchants a fee for each transaction. The fee structure varies by payment method and by country, but a typical rate is 2.4% of the transaction amount plus a fixed fee of 5 to 10 cents per transaction. For a $100 purchase, the merchant might pay $2.40 plus $0.10, totaling $2.50. For a $10 purchase, the fee might be $0.34.

You, the customer, do not pay Adyen's fee directly. The merchant absorbs it as a cost of doing business. Some merchants pass the cost along by raising prices, and some offer discounts for payment methods that cost them less (for example, bank transfers often cost less than credit cards). But there is no separate line item on your receipt for Adyen's processing fee.

Merchants also pay Adyen for additional services: fraud prevention tools, chargeback management, currency conversion, and access to Adyen's dashboard where they can view transaction history and settle disputes. These are optional add-ons, not included in the base transaction fee.

Disputes and chargebacks through Adyen

If you dispute a charge — for example, you were charged twice by mistake, or you did not receive the item you paid for — you contact your bank or credit card company, not Adyen directly. Your bank then contacts Adyen with the dispute details. Adyen investigates by checking the transaction record, the merchant's records, and any communication between you and the merchant. Adyen then advises your bank whether the dispute is valid.

If Adyen determines the merchant is at fault, it instructs the merchant's bank to refund you. If Adyen determines the charge was legitimate, it tells your bank that the merchant has evidence supporting the charge. Your bank makes the final decision about whether to refund you. This process typically takes 30 to 90 days.

Adyen also monitors transactions for fraud patterns. If it detects unusual activity — for example, multiple failed attempts from different countries in a short time — it may decline the transaction automatically or ask you to verify your identity. This is why some legitimate payments are declined: Adyen's fraud detection flagged them as potentially fraudulent, even though they were not.

Adyen versus other payment processors

Adyen competes with Stripe, Square, PayPal, and regional processors. The main differences are in which payment methods they support, which countries they operate in, their fee structures, and the tools they offer merchants. Stripe and Adyen are both global processors that support many payment methods and currencies; Stripe is often cheaper for small merchants, while Adyen is preferred by large retailers and marketplaces. Square is stronger in physical retail (in-person card readers) and small business. PayPal is older and more widely recognized but charges higher fees.

From a customer's perspective, the differences are minimal. All of them encrypt your data, route your payment through card networks or banks, and protect you against fraud. You will not notice a difference in speed or security. The choice of processor is the merchant's decision, not yours.

When Adyen might decline your payment

Adyen declines payments for several reasons. Your card might be expired, your account might not have sufficient funds, or your bank might have flagged the transaction as suspicious. Adyen's fraud detection might also decline the payment if the transaction looks unusual — for example, if you are trying to buy from a country where you have never shopped before, or if the amount is much larger than your typical purchases.

If your payment is declined, you will see a message on the screen explaining why, or you will be asked to verify your identity with your bank. You can then contact your bank to ask why the payment was declined, or you can try again with a different payment method. Declined payments do not result in a charge to your account — your bank does not deduct money for a failed transaction.

Frequently Asked Questions

Is my card number safe with Adyen?

Yes. Adyen encrypts your card number the moment it arrives at Adyen's servers, and it never stores the full number in plain text. Adyen is certified to the highest security standard for payment processors (PCI DSS Level 1) and undergoes annual audits. Your card details are never shared with the merchant or with third parties.

How long does it take for money to reach the merchant after I pay?

Your bank deducts the money from your account within one business day. The merchant's bank receives the funds within one to three business days, depending on the payment method and the banks involved. Bank transfers are usually slower than card payments. The merchant can see the transaction in their Adyen dashboard when ready, but the actual money arrives later.

What happens if I want to return something I bought through Adyen?

You contact the merchant, not Adyen. The merchant processes the return and issues a refund through Adyen. Adyen then sends the refund to your bank, which credits your account within one to three business days. Adyen does not handle returns — it only processes the payment and the refund.

Can Adyen see what I bought?

Adyen sees the transaction amount and the merchant's name, but not the specific items you purchased. That information stays between you and the merchant. Adyen's role is to move money, not to track what you spend it on.

Why was my payment declined even though I have money in my account?

Adyen's fraud detection might have flagged the transaction as suspicious, or your bank might have declined it for security reasons. You can contact your bank to ask why, or you can try the payment again. If it keeps failing, try a different payment method or contact the merchant's customer service.