Execute script on new subscription

How would i go about executing my own script once a new subscription is successful (paypal only payment).

I was thinking of putting a php exec into the paypal.php file within the processValidated function but not sure how to get the product and user id's passed, what i was thinking is something like this:

Code:

public function processValidated()
    {
        switch ($this->txn_type) {
            case self::TXN_SUBSCR_SIGNUP:
                if ($this->invoice->first_total <= 0) // no payment will be reported
                    if ($this->invoice->status == Invoice::PENDING) // handle only once
                        $this->invoice->addAccessPeriod($this); // add first trial period
                        exec('path/to/my/script.php?id=$payer_id&product=$product_id'); // this is my bit
            break;

but of course the question would be, how do i get the payer_id and product_id variables?

ANY help would be much appreciated.

Something like this:

PHP:

public function processValidated()
    {
        switch ($this->txn_type) {
            case self::TXN_SUBSCR_SIGNUP:
                if ($this->invoice->first_total <= 0) // no payment will be reported
                    if ($this->invoice->status == Invoice::PENDING) { // handle only once
                        $this->invoice->addAccessPeriod($this); // add first trial period
                        $payer_id = $this->invoice->user_id;
                        $product_ids = $this->invoice->getProducts();
                        foreach ($product_ids as $product_id) {
                            // NB: Can have multiple products per invoice
                            exec('path/to/my/script.php?id=$payer_id&product=$product_id'); // this is my bit
                        }
                    }
            break;

But custom stuff like this should really be implemented as a plugin or in site.php using the paymentAfterInsert hook.

e.g. site.php code might look something like:

PHP:

function customPaymentAfterInsert(Am_Event_PaymentAfterInsert $event)
    {
        $invoice = $event->getInvoice();
 
        $payer_id = $invoice->user_id;
        $product_ids = $invoice->getProducts();
        foreach ($product_ids as $product_id) {
            // NB: Can have multiple products per invoice
            exec('path/to/my/script.php?id=$payer_id&product=$product_id'); // this is my bit
        }
    }
Am_Di::getInstance()->hook->add('paymentAfterInsert', 'customPaymentAfterInsert');


Cheers
Rob

Ps - using exec is not advisable as it adds a potential security risk. Better to use Am_HttpRequest

PHP:

$http = new Am_HttpRequest("URL/to/my/script.php?id=$payer_id&product=$product_id");
$response = $http->send();