Configurable Invoice Due Dates for Subscriptions

🔍 Problem Statement

Subscription invoices in Pelcro are generated with a fixed due date relative to the billing cycle. Clients who need custom payment terms (e.g. Net 30, Net 60) cannot configure due dates per subscription or globally, forcing manual invoice adjustments.

💡 User Story

As a Pelcro admin, I want to configure invoice due dates (e.g. Net 15, Net 30, Net 60) at the subscription or account level, so that invoices automatically reflect agreed payment terms without manual edits.

🎯 Definition of Done (DoD)

A feature is done when:

✔️ Given a subscription with a configured due date rule (e.g. Net 30), when an invoice is generated for that subscription, then the due date is automatically set to 30 days from the invoice date — and the setting can be configured per subscription or as a global default.