When creating invoices on Titan Office, you can have the payment method already filled in with a specific entry for each client. This is particularly useful for requiring credit card payments from certain clients.
If you don't want to require all clients to pay by credit card, you can also choose individual clients you want to require to pay by credit card on a case‑by‑case basis in the Client Contacts section at the bottom. Jump to step 6 for details.