I'm embarking on a project to develop a platform that operates on a B2B2C model, and I could use some advice on how to structure it effectively. Here's a brief overview of what I have in mind:

• The platform will have an admin panel where multiple manufacturers and distributors can be onboarded.
• Distributors will have the ability to submit RFQs (Request for Quotation) to manufacturers.
• Manufacturers will respond to RFQs with quotes.
• Distributors will then receive RFQs from customers who sign up on the website.
• Distributors can create RFQs to manufacturers, who will respond with quotes.
• Customers will be able to generate purchase orders (POs) to distributors.

Each entity involved - admin, manufacturers, distributors, and customers - will have separate credentials and views.

I'd appreciate any insights or suggestions on how to efficiently implement this system, particularly regarding the backend architecture, database structure, and user authentication.