After months of talks and trials, WhatsApp has finally pulled the trigger on payments in its app. Today the Facebook-owned messaging service announced that users in Brazil would be the first to be able to send and receive money by way of its messaging app, using Facebook Pay.

WhatsApp says in its blog post that the payments service — which currently is free for consumers to use (that is, no commission fee taken) but businesses pay a processing fee to receive payments — will work by way of a six-digit PIN or fingerprint to complete transactions. You use it by linking up your Whatsapp account to your credit or debit card, and initial local partners for the service include Banco do Brasil, Nubank, and Sicredi. Cielo, a payments processor, is also a partner in the service. “We have built an open model to welcome more partners in the future,” it noted.

The news comes a little bit as a surprise: the company has been testing this payments service among users in India for months, so many assumed that the world’s second largest internet market would be the debut region for the service. But Facebook remains stuck in a regulatory maze in India that has prevented it from expanding the payments service in its biggest market.

WhatsApp has been used informally for commercial purposes almost from the very start: small business owners have used the platform to exchange messages with users around the sale of goods, what is in stock and so on. But under the wing of Facebook — which acquired the company in 2014 for $19 billion — the company started the big task of bringing in a more formal set of business services.

That’s included the launch of WhatsApp Business, which lets SMBs post catalogues and stock links within the app, and advertisers on Facebook can create links through to their WhatsApp accounts. Now with payments, WhatsApp, which has amassed over 2 billion users, is finally taking a more comprehensive commercial plunge.

“Payments on WhatsApp are beginning to roll out to people across Brazil beginning today and we look forward to bringing it to everyone as we go forward,” the company said.

Users in Brazil will be able to use the payments service on WhatsApp to make purchases from local businesses without leaving their chat, the Facebook-owned service said.

“The over 10 million small and micro businesses are the heartbeat of Brazil’s communities. It’s become second nature to send a zap to a business to get questions answered. Now in addition to viewing a store’s catalog, customers will be able to send payments for products as well,” the company wrote in a blog post.

Although WhatsApp has in theory been working on payments for years, from what we understand there were a lot of delays in part due to how Facebook wanted WhatsApp to implement it. Now that it’s launching with Facebook Pay, it seems that we know how that struggle landed.

More to follow…