How do I find Trade Assurance suppliers?

There are several methods to find suppliers that support Trade Assurance service.
Method 1: When searching for products, refine search result by Trade Assurance as below:

Method 2: Go to the supplier's minisite by clicking the company name to check whether Trade Assurance icon exists. If yes, it means the supplier supports Trade Assurance service.

What can I do if my supplier refuses to support the Trade Assurance service?