The abbreviated name of the carrier-specific service. For abbreviations, see the Services table on the carrier's reference page. EM - Priority Mail Express | PM - Priority Mail | FCM - First-Class Mail | PRCLSEL - Parcel Select | STDPOST - Standard Post | LIB - Library Mail | MEDIA - Media Mail | PMOD - Priority Mail Open and Distribute | EMI - Priority Mail Express International | PMI - Priority Mail International | FCMI - First-Class Mail International | FCPIS - First-Class Package International Service. For overseas tracking, Do the APIs support E-USPS DELCON?
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