Shopify Subscriptions

having a real problem trying to get the subscription to work with my app. Everything works on the app just fine. goes into the cart showing the subscription choice. But passing it to the checkout page on the site, which is where they are sent for secure checkout, it doesn't show up. Gets lost somewhere from the cart to checkout. I already found the numbers that are assigned to the options, but still comes up undefined. It shouldn't be an act of Congress to get it to jive. It works on the site just fine, just don't try and integrate it into your app. If I ever found out how to make it work I will share that with anybody else building their own app.