Recompute the average local lag by taking all samples within the
population distribution of the mean of all lag times for users in
the room, and taking the highest lag time of that range
refundUser: socialgoldTransactionID = id returned from
transaction you want to refund externalRefID = a unique string
that represents the transaction in your systems use a String
version of UUID.randomUUID.toString(), if you do not keep track
of your own txns, but remember this is the id, you will need to
pass into a call to refund valid formats = ["json", "xml"]
Optional: description = a short, but meaningful description of
the refund so the user will know what it was about
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