Plugin-tag: invitation code
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BSK Forms Blacklist
Checks field content and block submitting base on your keywords. Blocking IP, Country is only supported in the Pro version.
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Ashuwp invitaion code
Ashuwp_Invitation_Code is a wordpress plugin, It helps adding invitation codes for your site.
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Custom User Registration and Login Plugin
Improve user experience with a popup login and registration form widget using AJAX.