Wrong approach. You want to give me a dead simple API so that I can send highly personalized postcards in one's, two's or ten's to specific customers I'm market

Wrong approach. You want to give me a dead simple API so that I can send highly personalized postcards in one's, two's or ten's to specific customers I'm marketing to. Should be less complicated than the Stripe API and it should have hosted call to action that lets the recipient confirm they got the card so you can track and report value. What you have here has been done before many times.