Retrieving value in laravel API controller page sent by guzzle POST request

I'm sending a POST request using guzzle from a laravel project to external laravel api project. Request in sending properly and it returning but the thing i want to know is that i'm sending few parameters from laravel project to external laravel api using guzzle. How do i retrieve those sent parameter in that external laravel api controller page.

Here is sample of my code.From where i'm calling api.

$request = 
$client->
request('POST',
'http://ift.tt/2jPWXZO', 
    [
    'form_params' => 
    [
        'field_name' => 'abc',
        'other_field' => '123',
        'nested_field' => 
        [
            'nested' => 'hello'
        ]
    ]
    ]);

And this is the function in API project where i want to receive the request and print.

public function GetApplicationModuleList()
{
    echo 'here'; // Here i want to retrieve all the parameters values whic i already sent from above code.
}

via Chebli Mohamed