Can a client pay an invoice in parts instead of all at once?

Yes. Kliently supports partial payments. A client can pay part of an invoice now and the rest later, and each payment is recorded against that invoice so the running balance stays correct.

Every payment auto-reconciles, so the invoice always shows how much has been paid and how much remains. This is handy for deposits, milestone billing, or clients who'd rather split a larger amount across two transfers.