If you lost First-Class, they changed the name on March 7. It is now First-Class MailRM Letter OR Parcel (may vary based on HTML entities). I found the latest document through this link from google:
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0CCoQFjAA&url=https%3A%2F%2Fes.usps.com%2Fbusiness%2Fweb-tools-apis%2F2014-march-webtools-release-notes.rtf&ei=bHIeU9eqJ7Hy0QHp2oH4Cw&usg=AFQjCNFgJUI2WT4sYomB-7cHLmYhioCrFQ&sig2=H2_uLPMPdrsMPaNNIBbXJg&bvm=bv.62788935,d.dmQ&cad=rja