Registers (saves) and returns an unique string token
| Code | Description | 
|---|---|
| 401 | Unauthorized | 
| 404 | Not Found | 
| Param name | Description | 
|---|---|
| 
      auth_token  required  | 
    
      
 UUID Associated with an individual User Validations: 
  | 
  
| 
      auth_hash  optional  | 
    
      
 AuthUser hash used to pair up the correct User Validations: 
  |