Add a new function `resolve_fiat_offer_price_for_user` to determine the correct offer price for users based on their subscription choices and any applicable discounts. Update payment handlers for CryptoPay, FreeKassa, Platega, SeverPay, and YooKassa to utilize this function, ensuring callback price validation and improving error handling for price mismatches. This enhances security by preventing callback payload tampering and ensures accurate pricing for users.
- Integrated promo code service into subscription service to streamline discount consumption during payment processing.
- Improved error handling and logging for promo code activation and usage increment.
- Updated payment services to handle discount calculations more robustly, including fallback mechanisms for invalid discount scenarios.
- Added new methods for managing promo code activations and usage in the database layer.