Build payments with an API that stays out of your way

A predictable REST API, signed requests, idempotency everywhere and a sandbox that mirrors production.

Your first payment in three steps

Get sandbox keys
Create an API credential in the dashboard. Keys are shown once.
Create a payment intent
Send the amount, currency and terminal with a signed request.
Confirm and listen
Confirm with a test card and receive the result by webhook.

# Create a payment intent in the sandbox
curl https://api.sandbox.exelpay.com/v1/payment_intents \
  -H "ExelPay-Key-Id: key_01J..." \
  -H "ExelPay-Timestamp: 1798200000" \
  -H "ExelPay-Nonce: 6f1c9d2e-..." \
  -H "ExelPay-Signature: v1=..." \
  -H "Idempotency-Key: order-1042" \
  -H "Content-Type: application/json" \
  -d '{
    "amount_minor": 4820,
    "currency": "EUR",
    "terminal_id": "trm_...",
    "merchant_reference": "order-1042"
  }'

Built for developers

Signed requests

HMAC-SHA256 signatures with timestamps and nonces block replays.

Idempotency keys

Retry any money-moving request safely; duplicates return the first result.

Webhooks you can trust

Signed events, automatic retries, a dead-letter queue and manual resend.

Test cards and 3-D Secure

Published test cards and simulated challenges for every flow.

Versioned API

Pin a version date and upgrade on your own schedule.

OpenAPI 3.1

Generate clients and validate requests from the published specification.

Ready to move your payments forward?

Tell us about your business and we will design the right setup with you.

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