The present invention provides a media player configurable to provide the user with a seamless way of conducting transactions from within a window of the media player itself. All intermediate steps relating to the required transaction are carried out by calling up relevant modules/applications from within the application libraries from within an e-commerce platform. In preferred embodiments, the media player is configured to retrieve an encoded media file from a server or other content delivery network (CDN). The media player is further configured to display predefined overlays to the user during playback of the media file in response to identifying cues encoded into the media file by the content owner. The content owner can upload the media files to a server or other CDN via a dashboard/user interface. The cues can be encoded with a plurality of fields to enable the desired functionality to be achieved.