Thanks for sharing, diyguy!
It's my pleasure Berta. Bluedart is providing direct link and api as well. One thing i forgot to include is, most companies don't have a public API to fetch results. They may need to screen scrape.
Delivery is one of the important aspects of small commerce businesses. USPS, Bluedart, TNT, e.t.c are some of the most popular shipment companies in the world. If your business is online, it's essential to provide tracking links to your customers. Large websites integrate tracking modules directly to their websites. If you have the budget, you can get a developer to do it for you. Or else you can provide your customers with direct tracking links. For examples, USPS gives a direct link to track packages (All you need to do is append consignment number at the end of the url).
For Bluedart, you can use Bluedart tracking tool to track your parcels and shipments.
For other companies, there is this SpeedPost track tool. Most of such companies provides direct links.