Short answer
A certificate of authority is a state's permission for a company formed elsewhere to do business in that state, obtained through a process called foreign qualification. It is separate from any industry license. A company operating in several states often needs both: qualification in each state plus the activity-specific licenses.
States regulate out-of-state companies through foreign qualification. If your LLC or corporation was formed in one state and does business in another, the second state typically expects you to register there, appoint a registered agent, and keep up annual reports. The document you receive is commonly called a certificate of authority.
Qualification does not replace licensing. A lender formed in Delaware that qualifies in Texas still needs the Texas lending license before making loans there. Regulators frequently check for qualification during license review, so an application can stall if the entity has not registered in the state first. Handle both tracks together when you enter a new state.
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