@drbeatrizv Thank you for joining community!
I can help with instructions to turn off card processing in QuickBooks Online.
Here are steps to take to disable the feature after signing in:
It might seem as if the boxes reverted to their original state but once you create a new invoice you'll see the boxes on the invoice template are no longer checked for online payment processing.
You can also enable/disable card processing from individual invoices, QuickBooks Online is designed to memorize settings from prior transactions.
Let me know if that helps!