Mobile navigational control of terminal user interface

A method, comprising:

• detecting a Quick Response (QR) code scanned from a transaction display of a transaction terminal;
• decoding the QR code and obtaining a Uniform Resource Locator (URL) comprising a network address to a server, a vendor identification, and a transaction terminal identifier for the transaction terminal;
• connecting to the network address with the URL and providing a mobile device identifier for a mobile device;
• establishing a remote-control user session with the transaction terminal through the server;
• rendering a navigational control screen on a mobile device display of the mobile device for operation by a user that to control transaction screens rendered by a transaction interface on the transaction terminal during a transaction;
• and
• relaying key events received from the navigational control screen during the remote-control user session to an agent on the transaction terminal for delivery to the transaction interface and update of the transaction screens based on the key events.

A system comprising:

• a server comprising a processor and a non-transitory computer-readable storage medium;
• the non-transitory computer-readable medium comprising executable instructions;
• and
• the executable instructions when executed by the processor from the non-transitory computer-readable storage medium cause the processor to perform operations comprising:
• receiving a Uniform Resource Locator (URL) request comprising a vendor identifier for a vendor, a terminal identifier for a terminal;
• and a mobile device identifier for a mobile device operated by a user at the terminal;
• determining whether an existing mobile navigational control session is in progress between the terminal and a second mobile device and sending a connection terminated message to the mobile device when the existing mobile navigational control session is in progress;
• determining whether the terminal is accessible over a network connection to the server or whether a proxy device is accessible to the server over a second network connection with the proxy device accessible to the terminal over a local network connection between the proxy device and the terminal;
• establishing a mobile navigational control session via a network path between the mobile device and a User Interface (UI) agent on the terminal using a first network connection between the mobile device and the server and one of:
• the network connection between the server and the terminal or the second network connection between the server and the proxy device with the proxy device connecting to the terminal over the local network connection between the proxy device and the terminal;
• forwarding UI events sent from the mobile device over the network path to the agent of the terminal during the mobile navigational control session for delivery of the UI events as Human Interface Device (HID) events to a transaction interface of the terminal during a transaction by the user at the terminal;
• and
• forwarding a transaction interface end-of-transaction event received from the agent over the network path to the mobile device during the mobile navigational control session.