# Developers (/developers)

These guides are for developers connecting a shop's server to Fianto. Every checkout, one-time
or subscription, is created by your server through the v1 API.

- [Start](/developers/overview): The v1 API at a glance, and how to authenticate with your app id and secret.

- [Accept payments](/developers/checkout-sessions): Create one-time checkout sessions and subscription sessions from your server.

- [Webhooks](/developers/webhooks/overview): Receive and verify events, the event types, and how deliveries are retried.

- [Build safely](/developers/testing): How to test, idempotency keys, errors, pagination and rate limits.

- [Tools](/developers/sdks/overview): The SDK packages, the CLI and the example apps.