In-Memory example doesn't work

[westlakem]

I'm using the in-memory model and the code from the first page and I'm getting a lot of "model does not implement" errors.

For example:

"Invalid argument: model does not implement `saveAuthorizationCode()`"

[vijayantkatyal]

same issue.

have to create / import some functions manually for this to work.

you can use docs to fix this.

https://oauth2-server.readthedocs.io/en/latest/model/spec.html#saveauthorizationcode-code-client-user-callback