1 pointgood luck using an official WHMCS community to discuss alternatives to WHMCS! 😮
1 pointAddons are "linked" to products. Click on that Tsunami VG8.1 from clientarea to open details. In the sidebar you'll find "Addons" menu.
1 pointHello, Yes we developed Square Payment gateway module for latest WHMCS versions. You can check at : https://github.com/big89/whmcs-square-payment-gateway Let us know if you wants any additional help. Thanks & Regards, Logicmaker