Marine Cargo Insurance Policy

What is the policy of insurance service in marine insurance?
What is the policy Seller contigency?

I know this is not good to answer a question with a question, but do you sell or buy this insurance? If you buy, then have your agent answer for you - it is much too complicated to develop here. If you are an agent and sell to a customer, you must obtain from your carrier and get a model policy. It has all the definitions it contains.