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Integrate payments from your backend with a key scoped to one merchant and environment. Start in sandbox and enable live after payment readiness passes.

Create a Checkout

Create a hosted session and redirect the buyer to SimplePay.

Explore endpoints

Read the OpenAPI contract generated from the gateway.

Manage your catalog

Work with catalogs, products, variants, prices, and inventory.

Process events

Verify signatures, deduplicate events, and request replays.

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Select the correct environment

Sandbox and live use different hosts and keys:
Do not combine a sandbox host with a live key. The gateway rejects cross-environment combinations.

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Follow the integration flow

1

Create a sandbox key

Sign in to the dashboard, select the merchant, and limit its scopes.
2

Create a Checkout

Call the API from your backend with an idempotency key.
3

Connect webhooks

Verify the unmodified body and deduplicate each event ID.
4

Request live access

Enable live after payment readiness and end-to-end checks pass.
Last modified on August 22, 2026