Ariz. Rev. Stat. § 20-405
Before an unauthorized insurer may initiate any action or proceeding in this state, the insurer shall procure a certificate of authority to transact insurance in this state, or deposit with the clerk of the court in which the action or proceeding is pending cash or securities, or file with the clerk a bond with good and sufficient sureties, to be approved by the court, in an amount to be fixed by the court sufficient to secure the payment of any costs and attorney's fees which may be assessed against the unauthorized insurer in the action. The court may in its discretion make an order dispensing with the deposit or bond where the insurer makes a showing satisfactory to the court that it maintains in any state funds or securities, in trust or otherwise, sufficient and available to satisfy any such assessment which may be entered in the action or proceeding, and that the insurer will pay any final judgment entered therein without requiring suit to be brought on the judgment in the state where the funds or securities are located.
A.R.S. § 20-405