I am integrating USPS shipping apis in my module.I got couple of APIs from USPS site , but for integration of Priority Mail , Media Mail , Library Mail etc. services which API should i need to use.
Right now i found this document for such integration : Documentation
Is this API right? - ( https:// secure.shippingapis.com /ShippingAPI.dll ?API=DeliveryConfirmationV4 &XML=(see below))