WhatsApp will release a “full feature” inter-bank money transfer service in India, its biggest market, after a test involving a million users, National Payments Corp of India said.

Friday’s statement marks the de facto official launch of WhatsApp’s new service as NPCI is the body set up by the central bank and lenders to oversee payment services.

WhatsApp launched a limited service in India, where it has more than 200 million users, last week. The beta service uses customers’ phone numbers linked to bank accounts to facilitate payments and marks the first global foray into money transfers by the Facebook-owned firm.

Four banks will join the multi-bank BHIM United Payments Interface (UPI) model – which powers the payments service – and a full feature product shall be released after the beta test is successful, NPCI said. At present, India’s third-biggest lender ICICI Bank processes the fund transfers on WhatsApp, the application shows.
WhatsApp’s appeal in India is likely to pose a threat to established players, but it is entering a competitive market after Alphabet Inc’s Google launched a payments app last year to compete with local players.

The country’s cashless economy got a boost after Prime Minister Narendra Modi-led government banned old high-value currency notes in late 2016, leading to a surge in online payment providers such as homegrown player Paytm, the biggest in India.

Paytm, which is backed by Alibaba and SoftBank shared worries about the safety and security of WhatsApp’s new payments service in a statement released on Friday.