Learn how to use Register Helper to add a custom field to your membership site checkout page. You can use this to ask members for potential referrals, find out how members are hearing about you, or ask newly signed up members who referred them to your membership site….
Advanced Custom Fields is a popular plugin available in the WordPress.org Plugin Repository. The plugin allows you to add structured information to your posts, pages, and more.
This guide explains three primary methods to hide or show fields based on the membership requirements for the post.