Payment reminder notifications for overdue balances

Purpose

1.1. Automate reminders to clients with overdue payments for aircraft sales and brokerage invoices, minimizing manual follow-up, ensuring timely collections, reducing delinquencies, and maintaining positive cash flow in aviation dealer operations.
1.2. Centralize overdue invoice data retrieval and notification dispatch across channels (SMS, email, WhatsApp, phone).
1.3. Maintain audit trail, escalate high-value or chronically overdue accounts to upper management or legal for action.

Trigger Conditions

2.1. Invoice due date has passed by ‘X’ days in the ERP/CRM/Accounting system.
2.2. Payment status is “Unpaid” or “Partial” in financial database.
2.3. Configurable intervals for first, second, and final notices (e.g., 7, 14, 21 days overdue).

Platform Variants

3.1. Twilio SMS
• Feature/Setting: Messaging API — Configure outbound SMS via /Messages resource, use invoice amount and recipient contact.
3.2. SendGrid
• Feature/Setting: Email API v3 — Template-based emails, dynamic data injected, schedule via POST/mail/send.
3.3. Slack
• Feature/Setting: Incoming Webhooks — Notify internal finance team on delinquency escalations, POST message JSON.
3.4. WhatsApp Business API
• Feature/Setting: /messages endpoint — Automated WhatsApp reminders with invoice and payment link.
3.5. Mailgun
• Feature/Setting: /messages API — Trigger follow-up emails with overdue notice template.
3.6. Pipedrive
• Feature/Setting: Deal stage automation — Trigger custom webhooks when invoice-linked deals hit “Payment Overdue.”
3.7. Salesforce
• Feature/Setting: Workflow Rules — Auto-send notification email or SMS when Payment Status field is “Overdue.”
3.8. QuickBooks
• Feature/Setting: Webhooks/Notification API — Event on overdue invoices, send payment reminder to client contact.
3.9. Xero
• Feature/Setting: /invoices endpoint and Webhooks — Detect overdue status and invoke message flow.
3.10. Freshbooks
• Feature/Setting: Automated reminders — Schedule dunning notices for outstanding invoices from UI or API.
3.11. Zoho Books
• Feature/Setting: Auto-reminders — Configure time-based triggers for reminder emails to overdue clients.
3.12. HubSpot
• Feature/Setting: Workflows — When “Invoice Status” = Overdue, initiate payment reminder via email/SMS extension.
3.13. Microsoft Teams
• Feature/Setting: Adaptive Cards via Webhooks — Alert internal collections channel on failed payments.
3.14. Google Workspace (Gmail, Calendar)
• Feature/Setting: Apps Script — Auto-send templated emails and schedule escalation events.
3.15. Zendesk
• Feature/Setting: Triggers — Create tickets and send reminders when overdue status detected on client account.
3.16. Aircall
• Feature/Setting: Call Automation — Auto-dial overdue contacts, play pre-recorded message/schedule callback.
3.17. DocuSign
• Feature/Setting: Envelope Workflow — Attach overdue notice as signed document with action item.
3.18. Stripe
• Feature/Setting: /invoices/upcoming webhook — Notify when payment fails or is late, auto-remind via email.
3.19. PayPal
• Feature/Setting: Invoicing API — Automated dunning message if invoice status is still unpaid after threshold.
3.20. SAP
• Feature/Setting: Business Workflow automation — Customize notification flow for overdue AR items via BTP.

Benefits

4.1. Reduces elapsed days sales outstanding (DSO) and improves liquidity.
4.2. Eliminates manual errors and accelerates follow-up.
4.3. Increases collection rate and customer accountability.
4.4. Maintains professional communication and escalation standards.
4.5. Enables audit tracking for all reminders and responses across multiple channels.