A Certificate of Insurance (COI) (sometimes called an “acord certificate”) is a simple document issued by your insurance company that verifies that your business has insurance coverage. The COI summarizes what that coverage is, who it covers, the effective date of the policy, and the types and dollar amount of limits and deductibles. Listing owners will often ask that you provide a COI after you book your space (but before you've actually began your popup or event).  You should be able to obtain a COI simply by contacting your insurance provider or visiting their website.