If the method is commented to have @apiclientonly in the docblock, instead of denying only  OAuth Access Token use, it denies any use other than API key. 

This is directly counter the documentation: https://invisioncommunity.com/developers/rest-api?endpoint=core/members/POSTindex

On the surface, the problem seems to be that such methods are not actually available to be granted permissions in the scopes selection form in the ACP for Oauth Client Credentials.

I can't imagine this is intended given the documentation and code. I would appreciate it if this could be looked into, thank you. It is vastly preferred to use the security superior oauth for such work.

Edited November 12, 20186 yr by Marcher Technologies

What's the error you're getting?

{
"errorCode": "2S291\/3",
"errorMessage": "NO_PERMISSION"
}

To note, Other calls to endpoints actually listed in the scopes tab for oAuth Client config work:

The same for an API Key:

Note the missing endpoints in the former's case. I suspect this to be the root cause.

Edited November 13, 20186 yr by Marcher Technologies

We'll take a look, thanks