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E-commerce

Payment Gateway

Portrait of Lukas Horvath, co-founder of Roelu Studio
Lukas HorvathCo-founder

What is Payment Gateway?

A payment gateway is the service that securely captures payment details from a shopper at checkout and processes them through card networks, banks, and acquiring institutions to authorize and settle the transaction. Examples include Stripe, Adyen, Mollie, Braintree, and Worldpay. The gateway handles encryption, PCI compliance, fraud screening, and the technical handshake that turns a card number into authorized revenue for the merchant.

Why it matters

Payment is where shoppers quit. The wrong gateway means missing payment methods, declined cards that should have approved, surprise fees, and clunky checkout flows that punish conversion. The right gateway disappears — every method the shopper expects is there, every transaction either approves cleanly or fails with a useful message. For brands selling internationally, the gateway choice also determines which currencies, wallets, and local payment methods are available. Klarna in Germany. iDEAL in the Netherlands. PIX in Brazil. Get this wrong and you lose markets you didn't know you had.

How it works

At checkout, the shopper enters card details into a form or selects a wallet. The form is hosted or tokenized by the gateway so the merchant's servers never touch raw card data — that is what keeps the merchant out of PCI scope. The gateway sends the encrypted transaction to the acquiring bank, which routes it through the card network (Visa, Mastercard) to the issuing bank. The issuer either approves or declines. The response comes back through the same chain in under a second. On approval, the funds are reserved; on settlement, usually days later, they move to the merchant's bank account.

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