Facebook recommends keeping your checking accounts synced to Messenger (of course they do), but if you do not feel comfortable doing so you can enter your information anytime you make or receive a payment.
Notably, you do not even need a Facebook account any longer to use Messenger, making it even easier to pay your friends.
Messenger P2P Payments
We're happy to announce that Messenger person-to-person payments are now available to everyone in the U.S.! Add your Debit Card and pay anyone on Messenger in a few taps. Money goes straight from your checking account to the recipient's checking account. Easy and safe. As always, give it a try it and let us know how we can make even better for you!Posted by David Marcus on Tuesday, June 30, 2015