There are lots of ways to do something like this. But without know all the
other requirements AND/OR restrictions it's hard to help.
Created SDKs for the various platforms to access a central UserDB via Using
a pgp'ed xml packet and return a userID-PartnerID string with a checksum
sounds like a vague idea.
Look at WDDX for a easy to use XML schema, which has SDK's for
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