It's an interesting feature, but it seems unlikely that enough people will add their card information to Facebook to make it worthwhile, considering that both the payor and payee need CC information included for the payment to work.
On a related note, this continues Facebook's unfortunate user-interface decision to replace the simple "send" button in Facebook Messenger with a row of increasingly crowded and not-particularly-useful buttons to send various "other" things.
On a related note, this continues Facebook's unfortunate user-interface decision to replace the simple "send" button in Facebook Messenger with a row of increasingly crowded and not-particularly-useful buttons to send various "other" things.