Western Union and OzForex Group have parted ways on a planned takeover by the former of the latter, leaving investors in the listed Australian fintech star pondering its value.In late November OzForex said it received an indicative takeover proposal from Western Union to acquire 100 per cent of OzForex via a scheme of arrangement. Western Union at the time outlined an all-cash offer of A$3.50 to $3.70 a share.OzForex said yesterday that Western Union failed to submit a binding proposal and that the OzForex board opted to end discussions.The competitive landscape in the niche that is foreign exchange transfers has sharpened in that time. Industry researcher TNS recently calculated that TransferWise - a more recent arrival in the sector - charges fees that are around one-tenth of bank transfer fees and also cheaper than rival specialists, including OzForex and Currency Fair.OzForex yesterday also trimmed its guidance for profit growth for the year to June 2016 but stuck to an aspirational goal of doubling 2015 revenue by 2019.