** Shares of Integrated Research IRI.AX rise as much as
15.9% to A$0.365 - their biggest intraday gain since July 12
** Stock hits its highest level since Sept. 14
** Payment solutions provider says it signed a $6.6 mln
contract with U.S.-based financial technology co Fiserv FI.N
** Says contract is for renewal and capacity expansion of
FI's product lines
** Nearly 450,000 IRI shares change hands, versus the 30-day
average volume of 120,755
** IRI down 30% this year, based on last close
(Reporting by Aaditya Govind Rao)
((Aaditya.govindrao@thomsonreuters.com;))