What feature allows users to sign documents using their smartphone camera?

The feature that allows users to sign documents using their smartphone camera is known as the "Sign with Camera" feature. This functionality utilizes the camera on a smartphone to capture a signature directly on the document, providing a quick and convenient way for users to authenticate their identity and complete transactions without needing to print, sign by hand, and then scan or upload documents. This streamlines the signing process and enhances the overall user experience, particularly for those frequently on the move.

The other options may refer to related functionalities, but they do not specifically encapsulate the act of signing a document through the camera in the same direct manner as the "Sign with Camera" feature.