Thanks for trying it--it's my service, launched around Mother's Day of this year. I should make it clearer--it's secured with Stripe. All payment info is stored on Stripe.
Yeah, it does use HTTPS, but I'll definitely make it clearer. Thanks for the feedback! Cool to see multiple versions of the same underlying service being built. Competition on price, UI/UX (slight differences) , and marketing is what it will come down to. :) Good stuff, Postacard--seriously mean it! Fun little hack indeed.