When you have Stripe connected as your processor you have the option to include both credit card processing and ACH/Bank Transfer for your clients. You can override these options if you only want one.
To override GLOBALLY
Click the Gear Icon at the top of the page and go to the Receive Money tab.
Check only the option you want clients to use.
To override on per job/lead basis
Go to the job or lead
In the invoicing tab there click INVOICE OPTIONS
Then PAYMENT OPTIONS.
Check which payment type you want the client to use