In the current version, there's a matching set of API endpoints — Subscriptions, Packs, A la Carte (Meals by Unit), By the Pounds/Ingredients, Custom, Extras, Products, Catering, Grab & Go, Gift Cards, and POS, plus a shared Cart/Checkout endpoint — that mirror the same ordering data as the website. It's likely these power the mobile app, though that isn't explicitly labeled in the code, so treat this as our best inference rather than a confirmed fact.