Got some clarity from the team. The skip_receipt_screen only controls whether Square shows the screen that asks how you want a receipt. It has nothing to do with showing the signature or not. We unfortunately don’t have a parameter to show/hide signature screen. The workaround to stop showing it is to log out of the Terminal API mode, log-in to the regular square account using user name and password, and disable signature there. When you log back in to Terminal API, signature should be disabled. 