Send overdue invoice payment reminders with iFirma, Gmail, PostGrid and Slack

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Overdue Invoice Payment Reminder Workflow Documentation What Is This? This workflow is an automated invoice payment tracking and reminder system for the Polish accounting service iFirma.pl. It monitors unpaid and overdue invoices, then automatically sends escalating reminders to contractors based on configurable time thresholds. The system handles three escalation levels: payment reminders before/at due date, pre-trial summons, and formal legal action notices. Who Is It For? Designed for Pol