How Do Clients Pay Their Invoice Online?

After you enable gateways under System Settings → Online Payments → Online Payment Processors, clients can pay using the invoice Public Link.

When you email an invoice, the message can include a link to the online invoice. On that page, your client sees Pay with … buttons for each enabled processor at the top of the invoice (see below). They can also open the same link from the invoice row Public Link action in Xagle if you share it.