> getPayoff.send(valsJSON);

send() takes as its (optional) argument an Object with the options for
the   Request   (including   the   data:  property).  Or,  for  legacy
compatibility,  it  accepts  a  prepared Query String-formatted string
with keys and values.

Looks like you passed it valsJSON, which is a *JSON-encoded* string of
keys and values.

--Sandy



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