No i tried Jimmy Wu's solution above. Either way its the same. That array node doesn't even get recognized. It doesn't matter if i set that Array node var. It is just extra data now in the array. The error cleary states
"Error Message DomesticRatesV3;clsRateV3.ValidateFirstClassMailType;RateEngineV3.ProcessRequest - Invalid First Class Mail Type."
When i read this, it seems like there is either an attribute or another string we need to pass for shipping carrier if it is First Class Mail. I have written a USPS API Class, using SOAP. I dont get this error. A customer of ours wants to switch to First Class carrier, and we had this code in place because we used eCart. It would be nice to figure out what is wrong here, or else i can just write the live shipping quote myself.
Thanks in advance.