Help to use paypal_fulfillment

Hi,
I am new to gform and I need to use the paypal_fulfillment hook, but I face some issues:
-I added

"add_action("gform_paypal_fulfillment", "process_order", 10, 4); "

in Init function of paypal.php
-I created the following function in paypal.php:

function process_order($entry, $config, $transaction_id, $amount)
{
  global $wpdb;
  $order_id = $entry['id'];
  $start_date = $entry['payment_date'];
  $amount = $entry['payment_amount'];
  $pseudo = $entry['7'];
  $SQL = "INS ERT INTO test (order_id, pseudo, start_date, amount) VALUES ( $order_id, $pseudo, $start_date, $amount)";
   $wpdb->query($SQL);
}

But nothing is inserted in test table.

Can you help me?

Regards

[chrishajer edited INSERT to get past firewall]

Hi,
thanks for your reply, I re installed the plugin and added these lines in the theme's functions.php file. But it doesn't work.
What can I do?

Thanks

F

It is working.
Thanks