Finally, I was able to configure this app with my shopify. I like this app because it provides an option for local delivery setup ( charge fee based off zip code), and I can setup shipping for people out of state.
This App is showing a different rate compared to what I am seeing from Fedex ( Test rate) option, and the Fedex website itself. My rate from Fedex site matches to Fedex Test ( Under account integration)
I have tried all the options to figure this issue such as changing manage rates from zapiet to Fedex and vice versa, changing box size but no luck.
Any one can direct me to an app that has the same functionality?