error messge
ecoCart_USPS_ErrorCode: -2147219428
ecoCart_USPS_ErrorDescription: DomesticRatesV3;clsRateV3.ValidateFirstClassMailType;RateEngineV3.ProcessRequest - Invalid First Class Mail Type.
ecoCart_USPS_FullRequest: API=RateV3&XML=FIRST CLASS900699006901REGULAR