Joomla! 5.4.x, 6.x.x: CM Gift Card is compatible only with Joomla! 5.4.x and newer, including 6.x.x. Older versions of Joomla!, for example Joomla! 3.9.x, are not supported. Please see Joomla!’s Technical Requirements for more information.
Bootstrap 5: CM Gift Card requires Bootstrap 5 to be available on your site.
Cron job: you need a cron job to send electronic gift cards on their delivery dates.
mPDF library: you need the mPDF library if you want to send PDF invoices to your customers.
CM Gift Card Documentation