How does Clientjoy records the offline payments made by clients?

Offline payments made by the Clients need to be recorded manually in the software. To record payment, click on the Invoice Number from the invoice list view and click on the Record Payment button. You can select the Offline payment method through which you received the payment as the payment method from the drop-down and record the transaction ID and click on Record.

 

You can refer to the help article link - How can I setup offline payment methods?