want to develop a code in flutter

Want to develop the flutter module for my existing application. Its the digital gold sell online . Api taken for digigold.com
Figma file: https://www.figma.com/file/NW3OTexJFWx1MQo9Wk0ycu/Untitled?type=design&node-id=0%3A1&mode=design&t=mZnLNoRXoTt7uAiQ-1