The page type drives the checkout UI. Switching here changes which pricing inputs appear in step 3.
Options
Quantity selector (e.g., 6, 12, 24 tablets). Buttons are derived from each medication's quantity rows — no per-page list to maintain.
Subscription
Billing-period picker (monthly, yearly).
Combo
Per-card size + pay-plan picker (e.g. pay-in-full vs 3-month installments).
Direct
Single price, no selector.
No payment
Skip checkout — appointment created directly.