Begin of the insertion**Todo**End of the insertion Begin of the deletion **As** a OpenProject developer
**I want to** be able to authenticate outbound requests with the client credentials method of the OAuth2 RFC
**so that** I can choose the correct authentication method for any query I want to craft to do outbound requests.End of the deletion

Begin of the deletion **Acceptance criteria**

End of the deletion * Begin of the insertionintroduce new authentication layer that isEnd of the insertion Begin of the deletion If a developer writes code doing outbound request, he/she must be ableEnd of the deletion to Begin of the deletion reuse a general approach of authentication.

_Notes for QA: No UI testable. Tests need toEnd of the deletion be Begin of the insertionused in commands/queries
End of the insertion Begin of the deletion on Epic level._

_**UPDATE 2024-02-08**_

End of the deletion * Begin of the insertionreduceEnd of the insertion Begin of the deletion HTTPX latestEnd of the deletion oauth Begin of the insertionbackendEnd of the insertion Begin of the deletion plugin version now supports correctEnd of the deletion authentication Begin of the insertion(token refresh, etc.) functionalityEnd of the insertion Begin of the deletion `with_refresh_token` and `with_access_token`
* we should rewrite the authenticationEnd of the deletion in Begin of the deletion the queries and commands to use httpx authentication
* we need to rewrite the retry on 401|403 outside ofEnd of the deletion connection manager Begin of the deletion and usage of httpxEnd of the deletion