Every license is bound to your Figma User account. Before ordering you should put your Figma User ID, which you can find in DesignKit plugin under Settings tab.
After paying you will receive an email with a "License Key" during 30 mins that is needed for activating PRO functions.
Then you can put reached license key from your email to DesignKit plugin in Figma under Settings tab.
Before putting the key, please close DesignKit plugin and run it again!
Support
We specially created a Customer Portal page for the plugin. The portal link ie here: