The deal, which will see Citrus Pay become part of PayU's Indian operation, is the largest ever M&A cash deal in Indian fintech segment.
"The deal will grow PayU India customers to more than 30 million, processing a forecasted 150 million transactions in 2016 worth a combined USD 4.2 billion, growing at over 50 per cent year-on-year," PayU said in a statement.
The agreement is due to close in the third quarter of 2016.
Amrish Rau, currently Citrus Pay managing director, will become CEO of PayU in India.
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Reporting to PayU Global CEO, Laurent le Moal, he will lead the management team across PayU and Citrus Pay.
Citrus Pay founder Jitendra Gupta will drive PayU's Fintech foray into credit through Citrus Pay's Lazypay, while PayU cofounder Shailaz Nag will focus on new areas of growth through bank alliances.
Nitin Gupta (PayU cofounder) will help complete the transition to the new leadership team before departing PayU to pursue his entrepreneurial ambitions, the statement said.
"The announcement is a significant milestone for both businesses, as well as the fintech industry in India. It is exciting for everyone across the PayU and Citrus teams as we bring together new capabilities that will help us to better serve our collective clients," PayU CEO Laurent le Moal said.
Citrus Pay was founded in 2011 by Jitendra Gupta. It has become one of the fastest growing Indian fintech companies.
Following completion of the deal, Citrus Pay will be wholly owned by Naspers, strengthening its payments division.
Investec acted as the sole advisor to the transaction.