1. A portable device comprising: a display screen; a processor; and a non-transitory computer readable memory storing software instructions that, when executed by the processor, cause the processor to be configured to: store an identifier code in the memory; encode the identifier code into an image recognizable by an interactive system; and enable the interactive system to derive at least one characteristic of the image; enable the interactive system to recognize the image as including a known target object based at least in part on the at least one characteristic, wherein the known target object is associated with the identifier code; cause the interactive system to perform a transaction via an address upon recognizing the image by displaying the image on the display screen while proximate to an image sensor of the interactive system.