1. A method for linking a user of a first account to a second account, the method comprising, by a processor of a server computing device: receiving, from a client device in communication with the server computing device via a network, authentication information to authenticate the user to the server computing device via the first account using the authentication information; receiving, from the client device: a first electronic image comprising an image of a photo ID captured by a camera of the client device, the first electronic image comprising a first image of the face of the user obtained from an ID image of the face of the user arranged on the photo ID, and a second electronic image comprising a second image of the face of the user captured by the camera of the client device; determining whether the first image of the face of the user matches the second image of the face of the user; and generating a link between the first account and the second account responsive to the first image of the face of the user matching the second image of the face of the user.