I am trying to use Google Phishing Protection API over gRPC, everything seems straight-forward looking [here](https://cloud.google.com/phishing-protection/docs/reference/rpc/google.cloud.phishingprotection.v1beta1), but comparing to [here](https://cloud.google.com/phishing-protection/docs/quickstart-submission-api?#request) you can see that using REST you can send a request without authenticating or some-such, rather you can pass an API key as a query param.

I tested the REST option and it works for me, but trying to use the gRPC option I get failures while trying to authenticate, which I do not want to do.