How to detect invitation-only products via Selling Partner API?

[iisyos]

I'm working on integrating our application with Amazon's Selling Partner API and need to detect whether a product is using the "invitation-only shopping" format (where customers need to request an invitation to purchase).

I've searched through the API documentation including:

• Catalog Items API
• Listings Restrictions API
• Product Pricing API

However, I couldn't find any specific endpoint or field that provides this information. The Listings Restrictions API shows approval requirements but doesn't seem to specifically identify invitation-only products.

Is there an official way to programmatically determine if a product is being sold through the invitation-only shopping format via SP API? If not through a dedicated endpoint, is there perhaps a specific field or response pattern in one of the existing APIs that indicates this status?

Any guidance would be greatly appreciated.

Thank you!