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Vortex IQ Nerve Centre tracks 16 KPI pulses for Stax Payments stores. Each metric has its own page: definition, calculation, why it matters, and what to do when it moves. The Stax Payments connector brings the Vortex IQ AI OS to merchants using Stax (formerly Fattmerchant) for flat-rate subscription-pricing card processing across in-person, online, and B2B channels in the US. The Nerve Centre tracks 16 KPI pulses covering Success Rate, Decline Rate, 3DS Abandonment Rate, Refund Rate, Chargeback Rate, Dispute Rate, Avg Settlement Time, Pending Payouts, Top Decline Reasons, and Top Payment Methods. Vortex Mind investigates when decline patterns shift or chargebacks spike; Ask Viq™ answers in plain English with citations back to the transaction. Appendix space for FAQs, reconciliation guidance, or cross-connector notes specific to this connector. Replace this block when authored.