i have searched alot in internet and didnt find out any proper documentations for usps means they only provide few services like:
Rate Calculator (Both domestic and international) Zip code lookup by address City/State lookup by zip code Verify address Create Priority Shipping Labels Create Open & Distribute Shipping Labels Create International Shipping Labels (Express, Priority, First Class) Service Delivery Calculator Confirm Tracking
but how could i integrate but proper shipping using usps apis and the label printing and then tracking api for that shipments
You can access to USPS developer portal and reading their API document.Try to understand the function and then go to integrate it into your system https://developer.usps.com/getting-started