N.M. Stat. § 39-1-16

That it shall be unlawful to execute or procure to be executed as part of or in connection with the execution of any negotiable instrument, or other written contract to pay money, and before a cause of action thereon shall have accrued, any contract, agreement, provision or stipulation giving to any person or persons a power of attorney or authority as attorney for the maker or endorser thereof, in his name to appear in any court of record, and waive the service of process in an action to enforce payment of money claimed to be due thereon, or authorizing or purporting to authorize an attorney or agent, howsoever designated, to confess judgment on such instrument for a sum of money to be ascertained in a manner other than by action of the court upon a hearing after notice to the debtor, whether with or without an attorney fee, or authorizing or purporting to authorize any such attorney to release errors and the right of appealing from such judgment, or to consent to the issue of execution on such judgment. Any and all provisions hereinabove declared to be unlawful, contained in any contract, stipulation or power of attorney given or entered into before a cause of action on such promise to pay, shall have accrued, shall be void.