What Woocommerce function is called on PayPal IPN response?

Question

I'm having a problem figuring out what function gets called when a payment is completed with Woocommerce and PayPal sends the IPN.

The IPN is being received because PayPal log file is being updated as soon as I click Pay, but I can't figure out what function is writing to that file.

I need to figure out if there is already a built in functionality to send emails to the admin when an order is created, and where this happens.

If it does exist I need to modify it to email other people too, and if not then I need to create it myself, but I need to know where to put the code.

Answer 1

Checking the file /wp-content/plugins/woocommerce/classes/gateways/paypal/class-wc-paypal.php, we see that there's an action hook inside the function check_ipn_response:

if ($this->check_ipn_request_is_valid()) :

    header('HTTP/1.1 200 OK');

    do_action("valid-paypal-standard-ipn-request", $_POST);

You can hook into it like this:

add_action( 'valid-paypal-standard-ipn-request', 'so_12967331_ipn_response', 10, 1 );

function so_12967331_ipn_response( $formdata )
{
    // do your stuff
}