spcData payload (fairplay.cer) for FairPlay key server

We're sending the spcData payload to our fairplay key server (version 5.1) with the base64 encoded string of our fairPlay.cer that was downloaded from our developer portal and we're getting a spcVersionErr (-42580) for the spc version. The value that is being received by the key server seems to be 813827283 when it should be either 1 (base_constants.SPCVersion.v1.rawValue) or 2 (base_constant.SPCVersion.v2.rawValue). We're assuming we're encoding the fairplay.cer incorrectly. Any insight from anybody would be appreciated.

spcData payload (fairplay.cer) for FairPlay key server
 
 
Q