Proof posture
The strongest pressure usually comes after answering: discovery, records objections, standing challenges, and trial proof.
Arizona does NOT have a facial-pleading rule analogous to NJ R. 6:3-2(c) or Indiana's Debt Buyer Pleading Act. Chain-of-title attacks proceed through evidence-foundation challenges under Ariz. R. Evid. 803(6) (business records exception) and 902(11) (self-authentication of certified business records) plus general standing doctrine — they work, but require evidentiary discipline at trial / via discovery, not catching the complaint on its face. REVIVAL — A.R.S. § 12-508: post-expiration revival requires a WRITTEN, SIGNED acknowledgment. Partial payment alone does NOT revive a time-barred AZ debt — STRONGER protection than NJ. CHOICE-OF-LAW: if the cardholder agreement selects another state's law, that clause may shorten the applicable SOL — review the agreement or original complaint exhibits.