How to Generate a QR Code with Go

A Go program is created to generate QR codes, with an optional watermark overlay. The application uses a web service with a single endpoint (/generate) that supports POST requests. The code generates a plain QR code or one with an overlaid image based on the request parameters. It includes error handling and support for PNG images as the watermark. The program is tested using curl and Postman, and it successfully generates QR codes with and without watermarks.