Tracking Purchases

I am trying to use the Pay Pal Pro plug in to let users purchase 3 different pieces of content on my site. If the PayPal purchase goes through, I want to store the fact that they have made the purchase for future sessions.

I thought I could just store the purchased content in the user meta fields when gform_paypal_fulfillment is triggered. So far I am not having much luck. I am not sure if the method is getting called or not.

Am I on the right track or is there a simplier/better way to track purchases associated with users?

Here is the function I was using from functions.php:

add_action("gform_paypal_fulfillment", "process_order", 10, 4);
function process_order($entry, $config, $transaction_id, $amount) {
    $user_id = get_current_user_id();
    if($user_id)
	{
	    $key = 'boughtEthics';
		$value = $entry['3.3'];
		update_user_meta( $user_id, $key, $value);
	    $key = 'boughtGeneralTax';
		$value = $entry['4.3'];
		update_user_meta( $user_id, $key, $value);
	    $key = 'boughtCurrentTax';
		$value = $entry['5.3'];
		update_user_meta( $user_id, $key, $value);
	}
}

Thanks for checking. If this hook does not work with the PayPal Pro, is there a preferred way to track what users have bought for future sessions?

Thanks,
Mike

Thanks Chris! The beta version worked and the hook is being triggered. I have tested it with the PayPal in sandbox mode so far. We will turn it on live over the next day or so but I do not expect it to have any issues.

Thanks,
Mike