Adding more details to webhook - php

Question

I am using Instamojo for my laravel app.
I have a form with input name like vtype, vname, name, phone, date, price.
My instamojo index.php looks like this --
<?php
use App\Vname;
$vname = Vname::find($request->vname);
$api = new Instamojo\Instamojo(config('instamojo.api_key'), config('instamojo.auth_token'), 'https://test.instamojo.com/api/1.1/');
try {
$response = $api->paymentRequestCreate(array(
"purpose" => "Online Vazhipad",
"amount" => $vname->price,
"buyer_name" => $request->name,
"phone" => $request->phone,
"send_email" => true,
"email" => Auth::user()->email,
"allow_repeated_payments" => false,
"redirect_url" => url('/online_vazhipad/thankyou')
"webhook" => url('/online_vazhipad/webhook')
));
$pay_ulr = $response['longurl'];
header("Location: $pay_ulr");
exit();
}
catch (Exception $e) {
print('Error: ' . $e->getMessage());
}
?>
and my webhook file looks like this -
<?php
$data = $_POST;
$mac_provided = $data['mac'];
unset($data['mac']);
$ver = explode('.', phpversion());
$major = (int) $ver[0];
$minor = (int) $ver[1];
if($major >= 5 and $minor >= 4){
ksort($data, SORT_STRING | SORT_FLAG_CASE);
}
else{
uksort($data, 'strcasecmp');
}
$mac_calculated = hash_hmac("sha1", implode("|", $data), config('instamojo.private_salt'));
if($mac_provided == $mac_calculated){
echo "MAC is fine";
if($data['status'] == "Credit"){
// Payment was successful my database code will be placed here
}
else{
return 'failed';
}
}
else{
echo "Invalid MAC passed";
}
?>
I wanted to add more information to my database like vtype and vname, but I dont know how to get the data from the form to here.
From the documentation i came to know that, the post request we get from instamojo only contains this much.
Please help me.