Managing Different Response Structures and Database When Integrating Multiple E-commerce Platforms

I'm currently working on a project that involves integrating with various e-commerce platforms such as Etsy, Amazon, eBay, and Wayfair. These platforms offer functionalities like product listing, updating, invoicing, image uploading, and order retrieval. However, the challenge arises from the distinct response structures presented by each platform's APIs.

While the core operations across these platforms are similar, the APIs return responses in notably different formats. The diversity in response structures complicates the integration process. I'm seeking advice on how to efficiently handle these varying response structures while ensuring a clean and well-organized codebase in C#.

Moreover, I'd appreciate insights on how to manage the database schema for such an integration. Should I store all the platform-specific variables together or maintain separate product tables for each platform? How do I design the database to accommodate the unique attributes and requirements of each platform?

If any of you have faced similar challenges, I would greatly appreciate your insights and recommendations. Specifically, I'm interested in strategies to streamline the integration across multiple e-commerce platforms while adapting to their unique response structures. Additionally, I'm seeking guidance on the most effective database schema design to handle the diverse data coming from these platforms.

Thank you so much for your time and assistance in advance!