A travel booking engine manages promotional offers and discounts through:

. Pricing Rules: The engine applies predefined pricing rules that determine how discounts and offers are calculated. These rules can include seasonal pricing, bulk booking discounts, and special offers based on customer segments.

. Discount Codes: Users can enter discount codes during the booking process to receive reductions on their reservations. The booking engine validates these codes and applies the corresponding discounts to the final price.

. Promotional Campaigns: Travel booking engines support promotional campaigns by integrating with marketing tools that create and manage campaigns. These campaigns can include flash sales, limited-time offers, and loyalty rewards.

. Dynamic Pricing: The engine adjusts prices in real-time based on demand, availability, and market conditions. This dynamic pricing can be used to offer time-sensitive discounts and special promotions.

. Offer Management Tools: These tools allow administrators to configure and manage various types of promotions, set eligibility criteria, and monitor the performance of promotional activities.

Overall, pricing rules, discount codes, promotional campaigns, dynamic pricing, and offer management tools are key features that help a travel booking engine effectively manage promotional offers and discounts.