Hi Katrina! I’m Justin, and I work on the help center at HoneyBook. You may not need to notify the client/get them to resign the contract depending on the invoice’s file status. You will need to make some adjustments to the payment schedule to get those cash payments tracked in HoneyBook, though.
If your client is paying with cash, you can mark the payment as paid by going into the smart file’s Payment Schedule section, selecting the payment made outside of HoneyBook, then clicking on Mark as paid in the sidebar.
Are those cash payments lining up with the amounts in your payment schedule? If they aren’t, you can also adjust the amount for the payment/add more payments. Make sure you haven’t marked the payment as paid if you need to adjust the amounts though. Marking the payment as paid should be the last step.