Authorization API.
| Name | Resource | Description |
| Authenticate a user | POST api/2.0/authentication | Authenticates the current user by SMS, authenticator app, or without two-factor authentication. |
| Authenticate a user by code | POST api/2.0/authentication/{code} | Authenticates the current user by SMS or two-factor authentication code. |
| Send SMS code | POST api/2.0/authentication/sendsms | Sends SMS with an authentication code. |
| Set a mobile phone | POST api/2.0/authentication/setphone | Sets a mobile phone for the user with the name specified in the request. |