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Client Billing seems great and it will be almost perfect if you create APIs to allow us to create/subscribe new clients without inviting them (this could be done through Forminator as well).
But even if you make the API, it would be useless for me because the default invoice layout is ugly. Especially in Greek, it seems designed by an amateur.
We should be able to choose between different layouts and colors, customize our own with a UI builder or use our own CSS – ideally it should have all these options.