# API Definitions

- [API Information - Sandbox](/upland-developers/api-definitions/api-information-sandbox.md)
- [API Information - Production](/upland-developers/api-definitions/api-information-production.md)
- [Upland Users Authentication](/upland-developers/api-definitions/upland-users-authentication.md): An authenticated user on your application must authorize using of his upland data/assets by the following process.
- [Upland User Information](/upland-developers/api-definitions/upland-user-information.md): Endpoints to retrieve Upland Users information.
- [Escrow Container Management](/upland-developers/api-definitions/escrow-container-management.md)
- [Tournament APIs](/upland-developers/api-definitions/tournament-apis.md)
- [Generic Endpoints](/upland-developers/api-definitions/generic-endpoints.md)
- [Webhooks Notifications](/upland-developers/api-definitions/webhooks-notifications.md): Description of the webhook notifications send by Upland Developers APIs
- [Upland Appchain](/upland-developers/api-definitions/upland-appchain.md)