Final answer:
The document that an insurer must receive in order to transact insurance in a state is the Certificate of authority.
Step-by-step explanation:
The document that an insurer must receive in order to transact insurance in a state is the Certificate of authority. This document is issued by the state insurance regulator and grants the insurer the legal authority to conduct insurance business in that state. It verifies that the insurer meets the necessary financial requirements and has obtained the necessary licenses to operate.
Learn more about Insurance regulation