Not every WordPress site administrator wants to keep registration open to anyone and everyone. When you want to limit the site members to invited users only, you may want to try using invite codes.
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BAW Easy Invitation Codes is a new plugin that allows you to create invitation codes, share them, track the codes, and track the users.
Codes are generated in the WordPress dashboard:
Here’s what the registration form looks like with the code entry field:
This is a great plugin to consider if your site’s registration needs to be a bit more restricted. Download BAW Easy Invitation Codes for free from the WordPress plugin repository.