The new features will help Facebook, already a leader in digital advertising, offer personalized shopping experiences to its users, said Karandeep Anand, vice president of business products at Facebook.
Businesses will now be able to add a button on their Instagram profiles to let people send a WhatsApp message to the company with one click.
Integrating WhatsApp is particularly important for customers in countries such as India and Brazil, where the Facebook owned messaging app is widely used, Anand said.
Facebook said it will begin testing the ability for brands to send emails through Facebook Business Suite, a feature that lets businesses manage their presence across the social media site's apps, in order to simplify how companies reach customers.
It will also test new work accounts to let employees manage business pages without needing to log in with their personal accounts.
The new business tools come a day after WhatsApp began testing a new feature in Sao Paulo, Brazil to let users find shops and services through a directory in the app for the first time, part of an effort to bolster ecommerce on the service.