How to use API to POST my shop details to my own custom app

Retired Boards Appdev Graphql Basics And Troubleshooting
1

I’m currently building a test third party app within Shopify, and the functionality that I’m trying to achieve is as follows: Import my Shopify shop fields to my own web application; This way, users won’t need to sign up and add their own details again within the web app.

Below are the steps on how I’m trying to approach this

  1. GET shop details - This is successful.

  2. POST my shop details to my own custom app - This is where I’m stuck because I’m unable to find the documentation for the POST method in REST API. How can I accomplish step no. 2?

Kindly assist. Thank you.