How to integrate PayPal with FedEx, USPS?

Question

PHP

Hello. Maybe someone came across integration with PayPal with USPS/FedEx.
Now giving data to PayPal, you can give the shipping address, shipping cost, and carrier company. But I don’t quite understand what should happen next, that is, if that’s all, then how to get the tracking code, and if not, is it necessary to create a separate order for shipment through the carrier’s api, and how then the money from PayPal will get to the carrier. Can anyone come across something similar?

Answer 1

everything is bad with USPS in terms of api, it was around the spring of last year, maybe it has changed that
Paypal gives everything you want to the developer