Build me a shopify app

Hello,

I want an app that integrates with shopify and required delivery partners both.

Please go through shopify's app, "ShipTurtle" which is very much same as our requirement. So it will be easy for you to understand.

Here's the link to google doc file, containing requirements in detail.

https://docs.google.com/document/d/1sNXl_Woblza9no7KacDn_bwGIw2LYXiJwt0HXZ6T-0I/edit?usp=sharing

Feel free to discuss if any doubt.

Thank you.