Browse APIs

Adyen

Commercial

by Adyen N.V.

Enterprise payments platform with a single Checkout API for cards and local payment methods. In Singapore it supports PayNow (SGD, SG only) with real-time payments, QR code integration, refunds, partial refunds and separate captures via the standard /payments endpoint with paymentMethod.type set to paynow.

How to authenticate

  1. 1Sign up for an Adyen test account and create a merchant account in the Customer Area.
  2. 2Create an API credential under Developers > API credentials and generate an API key.
  3. 3Add PayNow as a payment method in your Customer Area for your Singapore merchant account.
  4. 4Send the key in the 'x-API-key' header on requests to the Checkout API (test host checkout-test.adyen.com; live uses your account-specific live URL prefix).
  5. 5POST /payments with amount.currency SGD and paymentMethod.type 'paynow'.

Example request

Request
curl -X POST 'https://checkout-test.adyen.com/v71/payments' -H 'x-API-key: YOUR_API_KEY' -H 'Content-Type: application/json' -d '{"merchantAccount":"YourMerchantAccount","amount":{"currency":"SGD","value":1000},"paymentMethod":{"type":"paynow"},"reference":"Your order number","returnUrl":"https://your-company.com/checkout"}'

Example response

Response (truncated)
{"resultCode":"Pending","action":{"paymentMethodType":"paynow","type":"qrCode","qrCodeData":"..."}}

Notes for AI agents

Enterprise-oriented: test account is self-serve but going live requires Adyen onboarding/KYC and enabling PayNow on your merchant account. Live API hosts are account-specific (unique live URL prefix), so the test base URL above is only for sandbox. Full OpenAPI specs are published in the Adyen/adyen-openapi GitHub repo.

Machine-readable version: /api/apis/adyen

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