If your client's in your office or has provided you with their credit card information, you can use that information to make a payment to the Invoice. To do this click on the Invoice listed under "Important Documents" (If you're creating the Invoice for the first time you'll need to create the Invoice first). After doing this, click on the "Preview" button at the top right corner, which will allow you to view the Invoice as if you were the client or allow your client to view the Invoice in person.
You'll then be able to select the "Pay Invoice" button and make that payment on your clients behalf or your client will be able to add their card information themselves if they're paying in person.
KeyWords: payments, pay, invoices, credit card, debit card,