If you’re migrating from s2member to Paid Memberships Pro, here’s one additional step needed to ensure PayPal IPN data is sent and updated within PMPro.
Customize and add this code to your theme’s functions.php file or a helper PMPro Customizations plugin (our recommended method).
The code would be very similar for other membership plugins. If you need help crafting this IPN redirect for another plugin migration, post to the member forums.
Adding the recipe to your website
You can add this recipe to your site by creating a custom plugin or using the Code Snippets plugin available for free in the WordPress repository. Read this companion article for step-by-step directions on either method.