The idea is kind of like payouts if you sell something in the marketplace after they sell something a request is made to admin for a withdraw and send the net proceeds ( Sales - Listing Fees - Merchant Fees )
A gift card could work the same way to pay it forward thanking someone with a tip or help for a problem.
Ideally & alternatively if each user had ability to add encrypted their own PayPal, Vimeo, or Stripe account API & Account credentials, a user could send money directly to that party and we wouldn't necessarily be party to the transaction.