If you but GB where do we have to pay from?
If you buy GB were do we get the bills from or how does it work? for icloud.
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See this link about how to purchase more iCloud Storage --> Buy more iCloud storage - Apple Support
Please Note: If you are buying more storage because you are low on memory on your iPhone, buying more iCloud storage won't help you. You cannot increase iPhone storage at all as it is fixed. If you are out of space for backups in iCloud, buying more iCloud storage will permit you to backup more data to the cloud, but again will NOT increase the available space on your phone.