To uninstall a plugin, open the plugin manager, select Uninstall, and confirm the uninstallation. You will then be asked in another prompt whether all associated data should be deleted. If you answer no, you can reinstall the plugin at a later time without having to redo the configuration.
Alternatively, you can also deactivate a plugin. This way, your data will remain in place, and only the plugin's functions will no longer be available. However, keep in mind that the plugin in question will continue to be billed despite being deactivated.
Please note that some plugins are interdependent. Therefore, before uninstalling, you should always check whether this could cause any issues.
Important notes on the Gift Vouchers plugin
If you want to uninstall this plugin, please note the following points:
1. What happens to vouchers already purchased (and partially redeemed) when the plugin is uninstalled?
2. The settings made here should be reverted, as otherwise error messages may occur in your shop.
Specifically, this means:
Under Settings → Basic Settings → Storefront → Shipping Costs Module, delete the following expression in the Extended SQL Query field:
,MIN(IFNULL(at.viison_coupon, 0)) AS allviisoncoupon
Delete the shipping method that was specifically created for vouchers.
In all other shipping methods, under Settings → Shipping Costs, in the Advanced Settings tab, delete the following expression in the Custom Conditions field:
!allviisoncoupon