The Custom Field Suggestions API allows you to retrieve the custom fields currently suggested on a site that haven't been assigned to members' profiles yet. All custom fields are automatically suggested for members to add to their profiles when they are created.
This API retrieves both custom fields and system fields available from the Wix Members Area.
The list of suggested fields can be found in the dashboard after clicking the "Add More Fields" button in the "Member Account & Profile Info" section. See Adding fields to member profiles for more information.
It’s important to note the following before starting to code: