The Graph API and Account Management API for Workplace are openly available APIs which can be called by any developer that knows how to call REST-based APIs. Access to these APIs is controlled by apps, with specific permissions and protected by access tokens.
Only System Administrators of a Workplace community can create apps and generate access tokens in that community.
When you create a custom integration, two objects are created:
A Custom Integration token is generated and shown to you when creating your custom integration, and this token can be used to read and write posts as your page.
To create an app for Workplace, follow the steps below:
As a system administrator, it's important to make sure that you only share access tokens with trusted developers within your organization and Facebook-approved third-party developers.