I need to use the Paypal IPN for two services. So, following the Zapier guide, I created a Webhook that sends a POST request to this URL https://italianindie.com/?wc-api=WC_Gateway_Paypal. It's the WooCommerce IPN URL for Paypal.
I've been using the same URL for months and it works. Orders and refunds are correctly processed.
But when I test the Zap, it gets an internal server error. How can I fix this?