Can I pay for all accounts on my domain with a single invoice?

Yes, you can designate a Master Account for your domain.

The subscription Plans purchased by the Billing Master Account are then available to all accounts on its same domain.

Whenever new camera streams are connected to an account of that domain, they use the Default Plan if no other Plan has been specified (e.g. by specifying the plan field in the CSV Import)

https://camio.com/domains

Master Account domain billing requires both credit approval and payment at the beginning of each billing period.

As new cameras are connected, the Overages are accumulated and invoiced for payment at the start of the next billing period. The Master Account can review usage-based charges for individual accounts on the domain at:

https://camio.com/account/balances

Contact your integrator to set up a Master Account for your domain.