MUMBAI, India — India’s smartphone users love Paytm for sending money and WhatsApp for sending messages. Now each company is getting into the other’s business.

Paytm unveiled an updated version of its service on Friday that integrates chat features, including photo and video sharing, into its market-leading digital wallet.

The move is a pre-emptive strike against WhatsApp, the global messaging app used by about two-thirds of India’s 300 million smartphone users. WhatsApp, which is owned by Facebook, has been developing a person-to-person payment service for India that it plans to introduce in the next few months.

Deepak Abbot, Paytm’s senior vice president of product, said his company had decided to add the communications feature, called Inbox, because its executives saw millions of people using its service to send money to other individuals without any way of discussing those payments inside the app.