Early-bird, presale, and hidden pricing

On a course's Pricing & sales tab, in the Pricing tiers section, you can create multiple time-based price tiers instead of a single fixed price — for example an early-bird price, a presale price, or a limited-time discount.

The system automatically applies whichever tier is currently active with the highest priority order; when no tier is active, it falls back to the course's regular price.

Tiers marked "hidden" don't appear on the course page at all — they're only reachable via a dedicated link containing ?tier=<tierId>, useful for a private discount offered to a specific list.