How to know WHMCS Admin Username for local API call?

How to know WHMCS Admin Username for local API call?

For calling WHMCS API’s internally from the WHMCS, we have a function named
localAPI. To call this function we have to pass
1)command; What api you would like to call.
2)data
3)admin user name of the WHMCS.

A sample API command UpdateClientProduct can be called as shown below.

        $command = 'UpdateClientProduct';
        $postData = array(
            'serviceid' => 11, // your service id
            'recurringamount' => 17,// recurring amount
        );
        //if WHMCS admin name is admin
        $adminUsername = "admin"; 
        $results = localAPI(
                       $command,
                       $postData, 
                       $adminUsername
        );

We hard coded the admin user name in the above code.
But hard coding the admin user name is a bad way of coding.
The code won’t work if admin username is changed or the code is uploaded
to another WHMCS where admin username is different.

So we can use below function to get the admin name.

use Illuminate\Database\Capsule\Manager as Capsule;
function getAdminUserName() {
    $adminData = Capsule::table('tbladmins')
            ->where('disabled', '=', 0)
            ->first();
    if (!empty($adminData))
        return $adminData->username;
    else
        die('No admin exist. Why So?');
}

So the API can be called as below.

  $command = 'UpdateClientProduct';
  $postData = array(
            'serviceid' => $product['service_id'],
            'recurringamount' => $deducted_amount,
  );
  $adminUsername = getAdminUserName();
  $results = localAPI(
                 $command, 
                 $postData, 
                $adminUsername
  );