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Adyen Checkout API
Adyen Checkout API is the modern payments API for new integrations — pairs with frontend drop-in components, auto-adapting to 250+ payment methods.
Adyen Payment API
Adyen Payments API is its flagship payment-processing API — authorize, capture, and refund across cards, local payment methods, and wallets.
Klarna Payments API V1
Klarna Payments API is Europe's leading Buy Now Pay Later (BNPL) service — installments, pay-in-30-days, flexible payment options that improve consumer conversion.
Payment Initiation API
UK Open Banking Payment Initiation API (PIS) lets authenticated third parties initiate transfers from user bank accounts with user consent (A2A payments).
PayPal API
PayPal API provides integration of the world's most recognized payment method — one-time payments, subscriptions, payouts, merchant tools, Venmo (US).