We have a number of open issues related to apparent OAuth support in Fineract.
IMHO it would be valuable both for end users deployment, integrators and new and old contributors to the project to have this feature documented.
So the goal of this issue is to have comprehensive documentation about Fineract's OAuth support in https://github.com/apache/fineract/tree/develop/docs/deployment/security.md.
This feature may be (apparently?) actually currently be broken on the develop branch as of today (and in 1.4.0), see
FINERACT-1144, but that shouldn't someone from contribution documentation of how it should work. That documentation should be able to be followed e.g. on 1.2.0 or 1.3.0 (but I think that's broken due to FINERACT-755, so build 1.3.1 from git).
PS: Once there is documentation, someone could then build an IT - that's unlocking FINERACT-1143.