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Scenario:
You are tasked with designing the pricing module for a B2B eCommerce platform. This module needs to handle complex pricing strategies, including:

Tiered Pricing: Different price levels based on the quantity ordered.

Volume Discounts: Discounts applied when a customer purchases above certain thresholds.

Customer-Specific Pricing: Special pricing agreements for specific customers based on contracts or negotiation.

Promotional Pricing: Temporary discounts for sales events or promotions.

System Design Question:
Design the pricing module for this B2B eCommerce platform. Consider the following aspects:

Data Structure: How would you design the data model to support multiple pricing strategies? Consider the relationships between products, customers, and pricing rules.

Scalability: How would you ensure that the pricing calculations can scale to support a large number of products and customers, especially during high-traffic periods?

Performance Optimization: Describe your approach to ensure real-time pricing calculations without impacting the performance of the checkout process.

Flexibility and Extensibility: How would you design the module to easily accommodate new pricing rules or changes to existing rules in the future?

Integration: How would you integrate this pricing module with the rest of the eCommerce platform, such as the product catalog and order management systems?

Testing and Validation: What strategies would you use to test and validate the accuracy of pricing calculations, especially for complex scenarios?