More and more users only have a mobile device like an Android or iPhone. They expect to do all Kolab related tasks with their device. This includes logging into the HKCCP and paying their invoices there.
Our support received several reports of users, you can not even log into the HKCCP with their mobile device (Androids and iPhones). I personally could also not log in with the latest Firefox on Android 5, because the menu was overlaying the password field.
All aspects of the HKCCP should also work with mobile devices, first and foremost login and invoice payments.