Logistics Delhivery and Xpressbees API Integration.

I have to integrate Delhivery and Xpressbees courier api in My Flutter and its web version. I am sharing the link of the project.
Flutter App:
https://codecanyon.net/item/eshop-flutter-multi-vendor-ecommerce-full-app/34108271
Web App:
https://codecanyon.net/item/eshop-web-multi-vendor-ecommerce-marketplace-cms/34380052