They offer a cash transfer service via Messenger (similar to Apple Pay Cash or Snap Cash where you hand over a debit card and then you can send money to friends

They offer a cash transfer service via Messenger (similar to Apple Pay Cash or Snap Cash where you hand over a debit card and then you can send money to friends). I believe they also used to have a system (maybe they still do?) where you could buy "Facebook Credits" to use on Facebook platform games, essentially microtransactions.