Gupshup offers a single programmable smart messaging API for enterprises to communicate with customers over WhatsApp as well as more than 30 other messaging channels including SMS, web, in-app, Twitter and Facebook Messenger.
"Group calls are always end-to-end encrypted, and we've designed calling to work reliably around the world in different network conditions", said Facebook-owned WhatsApp in a blog post.
If a business waits more than 24 hours to send a response, they will be charged for the message.
Importantly for Facebook, though, the expansion of WhatsApp Business also expands WhatsApp's ability to make money off its most popular messaging app.
WhatsApp will charge businesses to send messages such as a boarding pass or delivery confirmation.
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In return, the businesses will pay a fee for a confirmed delivery. They can be automated or provided by human customer assistants. To prevent spamming, businesses can send messages only to people who contacted them first.
Companies will pay between a half a penny and 9 cents for every message delivered to a potential customer, reported The Wall Street Journal.
"Gupshup is working with WhatsApp to enable enterprises to quickly and easily build a brand presence on WhatsApp". It also reported WhatsApp is now working with a select number of companies that specialize in managing customer communications to bring the API to more businesses over a period of time.
Facebook also said on Wednesday that users on its namesake app and Instagram can now see the amount of time they spend on the app each day and receive notifications when they exceed a self-prescribed threshold.