Facebook's new payment service will let you send money without fees across Facebook, Instagram, WhatsApp, and Messenger

• Facebook Pay is a new payment service that will let users send and receive money across the Facebook family of apps- Facebook, Messenger, Instagram, and WhatsApp.
• Facebook already had a service called Payments that worked with Messenger, but Facebook Pay works with credit cards and will maintain a transaction history.
• Facebook Pay must be setup for each app individually, so signing up for Facebook Pay on Instagram wont automatically setup Facebook pay for WhatsApp too.
• Facebook Pay arrives as Facebook works to approve a new digital cryptocurrency called Libra, but the company says Facebook Pay is separate project.
• In the future, Facebook wants people to be able to use Libra instead of US dollars and other traditional currency for payments in the future.
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Facebook launched a new payment service on Tuesday that will let users of its family of apps - including Instagram, WhatsApp and Messenger - send and receive money and make purchases, a move that lets Facebook match popular features offered by competitors while its more ambitious Libra digital payments system is mired in scrutiny.

The Facebook Pay service is similar to Venmo, Google Wallet and Apple Pay, allowing users to transfer money directly from their bank account or credit cards. It will also be accepted as payment on the Facebook Marketplace. However, Facebook Pay has no fees and will not store money in an online account.

Facebook Messenger already had a service called Payments that let people send money from their bank accounts, but it didn't support major credit cards. Facebook Pay will accept most major credit cards, including Visa, Mastercard, and users can also connect a PayPal account. Facebook says PayPal, Stripe and other international partners will process payments for Facebook Pay.

The rollout comes as Facebook's faces intense regulatory scrutiny over its planned Libra digital currency, an entirely new payment system with its own value, that would allow smartphone users anywhere in the world to conduct transactions. Many of the partners that were part of Facebook's June Libra announcement, such as MasterCard, Visa and eBay, have since dropped out of the project.

Facebook Pay also provides a unifying thread across Facebook's collection of disparate apps at at time when critics, including several US presidential candidates, are calling to break up the company.

Facebook Pay is available now on Facebook and Facebook Messenger in the United States, it will launch on Instagram and WhatsApp at a later date. While you need to be logged into one of these apps to use Facebook Pay, you don't need a Facebook account to use the service.

Payment data can be used for ads

But Facebook Pay could trigger its own scrutiny and pushback among privacy watchdogs because of the company's plans to use people's transaction data in its multibillion ad business.

Facebook Pay will provide a transaction history and payment details across all of Facebook's family of apps, but it wont be visible to the public unless you choose to share it. Credit card data will be encrypted and Facebook Pay users can opt to lock their account with a pin. However, Facebook says that data collected from Facebook Pay transactions could be used for future advertisements.

"For example, if you buy a baseball glove on Facebook Marketplace, you might see an ad for a baseball bat," Facebook's announcement reads.

Facebook Pay must be added to each app individually, so it wont automatically show up in WhatsApp if you setup Facebook Pay on Facebook first. Facebook Pay will also be accepted as payment on the Facebook Marketplace.

Facebook said that Facebook Pay is not related to the company's plans to launch a cryptocurrency called Libra. While Facebook wants Libra to be an alternative to US dollars and other national currencies in the future, it said Facebook pay will rely on "existing financial infrastructure and partnerships."

You can setup Facebook Pay in the Settings menu on the Facebook app or website.