Searches for a user with the specified user details and returns it.
| by | The user detail name. Accepted values: email,first_name,last_name,phone,[extra](replace[extra]with any user additional detail name). | 
| value | The value of the field. | 
Response
{
    "id": "881",
    "first_name": "Don",
    "last_name": "John",
    "email": "[email protected]",
    "user_type": "visitor",
    "department": null
 }
Returns {"success":true, "response":false} if the user is not found.