Use Reset Bandwidth API to reset bandwidth of vps manually it takes bwreset as parameter (i.e. vpsid) and in response it gives done parameter that contains 1 if successful .
HTTP Request
https://domain:4085/index.php?adminapikey=abc&adminapipass=xyz&act=vs&bwreset=your-vps-id
Parameters
| Name | Method | Value | Description | Required | 
|---|---|---|---|---|
| act | GET | vs | The action specified to retrieve data after vps is started | Yes | 
| bwreset | GET | Int | The ID of the vps. | Yes | 
Sample Code
<?php
    require_once('/usr/local/virtualizor/sdk/admin.php');
    $key =  'your_api_key';
    $pass = 'your_api_pass';
    $ip = 'your_server_ip';
    $admin = new Virtualizor_Admin_API($ip, $key, $pass);
    $bwreset = 2; //VPS ID
    $output = $admin->resetbandwidth($bwreset);
    print_r(json_encode($output));
?>
Output
{
   "title":"Virtual Servers",
   "done_msg":"The Bandwidth was reset successfully",
   "done":1,
   "timenow":1575526769,
   "time_taken":"0.071"
}