Windows & Mac widget developer required which needs to be displayed at the locked screen

Points to mention in the job post:  Simple app to be built for Windows & Mac laptops widget.  Image's default background/space must be White (follow attached prototype screens).  The text part of the widget can have text with links.  The app will accept one alphanumeric code which will be sent to a URL (API) for validation. If validation is successful, the API will respond to true flag and a URL of an image. That image should be placed in the left part of the sample image (follow attached prototype screens).  API URL and request/response parameters need to be determined.  The image part of the widget can be of size 150 X 150 pixels. Instructions:  The support period is required.  The code should be having proper comments for all the functions and libraries used.  The code must be delivered to us on completion.