Respected Sir,
I have read initial high level details, so my understanding is that you want an Application for online sale of from warehouse to customer with Shipping and tracking API and direct bank API for payments.
Relevant Skills and Experience
We have experience working on similar projects but once you answer below questions, then I would be in a better position to give you better answer.
Proposed Milestones
We can finalize it, once you initiate the chat.
Below are my questions
1. For payments, which bank API you want to integrate ? Please provide us API name and their documentations.
2. For shipping and tracking, which API you want to integrate?
3. Do you want to manage stock of warehouse through website Admin?