Handwrytten is a way to automatically send real cards and notes written in pen and ink.
You can find more information here.
Triggers when the list of user's credit cards is needed.
Triggers when a user needs a list of fonts.
Triggers when a list of all addresses is needed.
Triggers when asked for a list of cards in the user's account.
Triggers when a list of denominations is needed.
Sends a card to a new recipient (US addresses only).