New creates a new Oura provider (for OuraRing), and sets up important connection details.

NewAPIError initializes an Oura APIError.

ScopeDaily includes daily summaries of sleep, activity and readiness.

ScopeEmail includes email address of the user.

ScopePersonal includes personal information (gender, age, height, weight).

APIError describes an error from the Oura API.

Provider is the implementation of `goth.Provider` for accessing Oura API.

Session stores data during the auth process with Oura.