Migrating API v4.1 Integration to SuiteCRM 8.5.1 (V8 or GraphQL)

If you have a working v8, you have a working GraphQL endpoint, because everything in v8 goes through the API, the entire app goes through that (unlike in v7, where the API was only for external access, for integrations).

There isn’t much documentation on this, but there are some tips here

and something about custom endpoints here: