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Open the profile menu in Business view and select Developers. The page has separate API Keys and Webhooks tabs.

API key types

Create only the key type required by the integration. Copy a new secret immediately and store it in a server-side secrets manager; the complete value may not be shown again.
Never put either key in browser JavaScript, a mobile binary, source control, screenshots, support tickets, or telemetry.

Webhook endpoints

The Webhooks tab lets you create, update, enable, disable, and remove organization-scoped HTTPS endpoints. Anyway signs deliveries with its platform Ed25519 key; verification uses the published public key rather than a per-endpoint shared secret.

Merchant API

Review the stable server API and its generated contract.

Webhook API

Verify signatures and implement idempotent fulfillment.