We do many things with WhatsApp. Initially the platform - today owned by Meta - was only for sending messages, then it was enabled for calls and video calls and today it is common to use it to send documents, proposals and even contracts. 

Now Meta is going one step further. In early March, Brazil's Central Bank approved the use of Meta's payments platform in small and medium-sized businesses in the country via WhatsApp. 

Meta is using Brazil as a testing ground for its business messaging, in a strategy that seeks to offset falling advertising revenues. Brazilians could make payments via WhatsApp since 2021, but only between individuals. Now they will be able to make payments to small and medium-sized businesses through the platform.

https://www.reuters.com/technology/brazil-central-bank-greenlights-metas-whatsapp-merchant-payment-system-2023-03-02/