To add a product type with custom pricing, the Architect needs to do the following steps:
Create a content of the etc/product_types.xml file that defines the new product type, its label, model, index priority, and price model. This file is used to register the new product type and its associated classes in Magento1.
Create a new price model that extends \Magento\Catalog\Model\Product\Type\Price and implements the custom pricing logic for the new product type. The price model is responsible for calculating the final price of the product based on various factors, such as special price, tier price, catalog price rules, etc2.
Create a custom type model that extends from the abstract Product Type model (\Magento\Catalog\Model\Product\Type\AbstractType) and overrides the methods related to the product type behavior, such as prepareForCart, getAssociatedProducts, etc. The type model defines how the product type interacts with other components, such as quote, order, cart, etc3. References:
How to add a new product type in Magento 2? (MageStackDay mystery question 1) - Magento Stack Exchange
Magento 2: How to create custom product types - BelVG Blog
Magento 2: How to create custom product types - BelVG Blog
