"Early-bird" and "last-minute" pricing for products

[NamFra]

Feature Request

Is your feature request related to a problem or unsupported use case? Please describe.

Currently, there is no way to dynamically adjust product prices based on temporary offers, such as "early-bird" or "last-minute" discounts. This limitation affects the implementation of flexible pricing strategies.

Describe the solution you'd like

Introduce a feature in Joanie to manage temporary discounts with:

• Configurable discounts (fixed amount or percentage)
• Validity period (specific dates or duration)
• Automatic return to standard pricing after expiration
• Dynamic display of active discounts on Richie
• Accurate reflection on payment schedules and contracts

Describe alternatives you've considered

• Manually creating separate products for standard and discounted prices (impractical and not scalable).
• Manually applying promo codes, which does not automate price adjustments or conditional display.
• Preventing the risk of overlapping or incorrect application of discounts (parallel development of promo codes).

Discovery, Documentation, Adoption, Migration Strategy

The chosen solution is to create a Discount object that will be linked to a product's OrderGroup (#1055).
In the future, this object could be linked to a discount code, which would allow for parallel development of this feature (see #1019 and #1031).

Tasks:

• Add fields in Joanie's OrderGroup to configure the discount type, value, and validity period.
• Develop a front-end integration on Richie to display dynamic offers (e.g., "Offer valid until X" - Enhance course product widget to display discounted prices richie#2584).
• Integrate discount information into CSV exports or order views (e.g., "Discount type: early-bird").
• Test and validate discount functionality across all use cases, including:
  • Correct application of discounts (early-bird, last-minute) on product pages
  • Accurate display on Richie, including validity periods and countdowns (if requested)
  • Proper reflection of discounted prices in payment schedules and contracts
  • CSV export accuracy

Additional Considerations:

• Evaluate the need to limit the number of available discounted seats (e.g., X early-bird enrollments).
• Ensure compatibility with free enrollments outside the discount period (100% coupons).
• In the future, consider extending this feature to certificates: Richie display and Joanie product integration (with ✨(courses) add offer and price fields to courseRun richie#2549 ?).