Fire during WP Travel listen for $_GET request from PayPal IPN.
Source
File: /inc/gateways/standard-paypal/paypal-functionst.php
Used by: /inc/gateways/standard-paypal/paypal-functionst.php
Example:
function prefix_wp_travel_verify_paypal_ipn() { // Code here. } add_action( ‘wp_travel_verify_paypal_ipn', 'prefix_wp_travel_verify_paypal_ipn’ );