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Bill system allows to automatically charge the credit card when invoice is created. To do that client need to provide a credit card, but before he will be able to do that you need to activate it in a stripe payment settings:
When it's activated client in a client panel will find another section called "My credit cards"
In there he will be able to add a valid credit card:
Now every time an invoice is created within the billing system, bil will charge the credit card