Can clients pay an invoice directly from the portal?

Yes. Invoices in the portal include pay buttons for every method you've enabled, so a client reviews the invoice and pays in the same place, without you sending a separate payment link.

Because Kliently supports six payment rails and money flows to your own accounts, the client simply picks whatever's enabled for them. Each payment then auto-reconciles the invoice, so your books stay correct without manual matching. More in invoicing.