1. BUDDYPRESS SETTINGS

• Make sure that Membership is enabled to make sure anyone can register on the website. 
• Navigate to the WordPress Admin Dashboard → Settings → General.

• Now you’re on the General Settings page.
• On the General Settings page, go to the Membership option and checkmark the checkbox.

• Click on the Save Changes button.
• Navigate to the WordPress Admin Dashboard → Settings → BuddyPress.
• Navigate to Components and set your desired settings.

• Navigate to Options and set your desired settings.

• Navigate to Pages and set your desired settings.

• Generate a Invitation Code.

2. BUDDYPRESS- INVITATION CODE

• When the Enable Invitation Code option is enabled, users can now be invited to register for the website by allowing them to register via an invitation code.
• This will allow the possibility to create an invitation-only registration scenario if you want to add exclusivity to the registration process.

• Click on the Save Changes button to apply your settings.
• Once this option is enabled and saved, an option titled Invitation Code would appear in the Approve New Users section on the Dashboard.
• Now navigate to Admin Dashboard → New Users Approve → Invitation Code.

• You’ll be on the Invitation Code Settings page
• Go to the Add Codes tab.

2.1 ADD CODES

• The invitation codes can be generated manually or automatically; each option has its configuration settings to achieve desired results.

2.1.1 MANUAL GENERATE

• In the Add Codes textbox, you can enter your invitation code (one line for each Invitation code).
• Set the Usage Limit.
• Set the Expiry Date.

• Click on the Save Changes button.
• Once the operation is successful you’ll receive a notification labeled as Post Successfully Added.

2.1.2 AUTO GENERATE

• Set the Code Prefix.
• Set the Code Suffix.
• Set the Usage Limit.
• Set the Expiry Date.

• Click on the Save Changes button.
• Once the operation is successful you’ll receive a notification labeled as (Number of Code Quantity set) Invitation Code Successfully added. According to the above image, the notification would be 5 Invitation Code Successfully added.
• Go to Admin Dashboard → New Users Approve → All Codes.

• All the codes which were Manually generated and Auto-generated will be present here.

• Using these codes, the user will be registered and moved to the approved section.

FRONT-END IMPACT

• Go to the membership page and enter the required credentials.
• Once done, click on the Sign Up button.
• Whenever a user tries to register with his email address having the domain mentioned in the whitelist, his request will be accepted.
• Enter the invitation code which was generated above.

• When the user sign up, user will be registered for using respective invitation code.