How do I enter my 4-digit code on Facebook?
Tap Profiles, then tap your profile. Tap Passcode, then tap Change Passcode. Enter your current passcode. Enter your new 4-digit passcode.
What is Facebook PIN code?
Payments in Messenger are only available in the US at this time. To help keep your account secure, you can set up a PIN (personal identification number) as a security check on payments in Messenger. ... Enter a four-digit Facebook Pay PIN.