With PayPal Standard
Clicking on the “Pay for Listing” will redirect the user to the PayPal payment page hosted on their servers. Once the payment was successful, the user can manually click to return to your Classifieds WP site. Alternatively, you can also set up an auto-redirect in your PayPal dashboard.
Upon return, the confirmation page will be displayed. If you configured “Payment Data Transfer” in the settings, the listing should be marked as “Paid” immediately. Otherwise, the PayPal IPN should be used and PayPal will notify your site of the payment status.
PayPal IPN can fail in some hosting environments due to plugins, blocked ports and server firewalls. In these instances, we recommend setting up “Payment Data Transfer” as it’s usually more reliable.