Invite Code is an extension that allows customers to join more privileged customer groups using the invite codes.
Compatible with OpenCart 2.2.x-3.x versions.

Features
* Allow to join higher-level groups from the customer account.
* Allow to join a non-default higher-level group upon the registration.
* Validity period (separately for each group).
* The sort order determines the priority of customer groups.
* Does not modify system files (OCMOD).

Disclaimer
The extension has been tested with the default OpenCart structure and theme, but third-party themes or extensions may cause incompatibilities and may require additional tweaking to fix this. The developer is not responsible for this and is not obliged to fix it, but can do so for an additional fee, which is discussed separately.

Live demo
* Module settings.
* Customer Groups.
* Store Front - use invite codes from the customer groups settings to register and transfer between groups.

Related links
* How-To.
* Changelog.
* End-User License Agreement.
* Invite Code web page.

Related extensions
* Automatically move customers to more privileged customer groups when their spending reaches set thresholds using the Customer Loyalty module.
* Automatically assign newly registered customers to a defined customer group by using the Default Registration Group extension.
* Check the number of members in customer groups using the Customer Group Size extension.
* Allow foreign customers to get the same gross prices as in the country where the store is located (despite different VAT rates) using Consistent Pricing module.

Contact
If you have any related questions, please contact me using the "Get Support" form, comments below, or by email: ocmod.space@gmail.com.

Feedback
I like feedbacks, so write comments and rate the extension in your OpenCart Marketplace account ("Rate your Downloads" section).

Discount
If you want to get a discount or buy some of my extensions - contact me by email: ocmod.space@gmail.com.