I am trying to register a new user on Drupal7 via services with JSON. Actually I am posting info from JAVA (android) with JSON format to the server with services module enabled. A sample successful JSON post is: 

```
    {
    "name": "erfan",
    "pass": "1234",
    "mail": "erfan@example.com",
    "status": "1"
     }

```

> 
> **URL:** [siteURL]/[endpoint]/user/register
> 
> 
> 

I was successful creating users with basic info such as name,email,status. 

I have added custom fields like `field_address`, `field_phone`, etc to the web site and want to send them via JSON to the server. 

The problem is I can not figure out how to post these data to the server and couldn't find any documentation about it. My trial and error approach was not successful too, because I am not good in PHP coding. So please help me. Thanks.