Sorry if you answered this somewhere else. But does it use LOB's API to send the postcard? I wonder if there is data/logic on what would be the optimal locatio

Sorry if you answered this somewhere else. But does it use LOB's API to send the postcard? I wonder if there is data/logic on what would be the optimal locations (countries/cities/towns) where it is cheapest and fastest to send a postcard to that country or neighboring countries.