Mumbai: Facebook Inc. is set to launch its WhatsApp payment services to the whole of India as early as next week in an attempt to win market share from rivals Paytm and Google Tez, even though its partners aren’t all ready, said people familiar with the matter.

WhatsApp Pay will partner HDFC Bank Ltd., ICICI Bank Ltd. and Axis Bank Ltd. to process the transfers, and State Bank of India (SBI) will join once it has the necessary systems in place, the people said. Facebook was aiming for a full rollout with four partners but decided to go ahead with just three as its rivals were racing ahead, the people said, asking not to be named as the information isn’t public.

The entry of WhatsApp into India’s payments space has been likened to WeChat, which reshaped payments in China when it expanded beyond messaging. The pilot version of WhatsApp Pay—started with 1 million users in February—received rave reviews, threatening the market share of incumbents Google Tez and Alibaba-backed Paytm, which lack the benefits of a social network.

“WhatsApp has a great starting point: a monopoly in chat," said Vivek Belgavi, leader for financial technology at PwC India. “High engagement makes it a credible competition."

More than 200 million Indians already use WhatsApp messaging, equivalent to 60% of the US population and a daily active usage that Forrester Inc. estimates to be about 20 times higher than Paytm’s.

Emails to representatives of WhatsApp, State Bank of India, HDFC Bank, ICICI Bank and Axis Bank weren’t immediately answered.

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