Finance & Accountingfree

Vendor Invoice Duplicate Payment Blocker

by Avkash KakdiyaUpdated Aug 2026

Requires

Google SheetsSlack

Gmail

1/5

STEPS · 14

Starts on an incoming request

On webhook, checks Google Sheets for duplicate invoices, alerts via Slack and Gmail, and returns a response.

PayPal Payment to Accounting Sheet

Receives PayPal IPN webhooks, records completed payments to an accounting sheet, and alerts finance in Slack.

When a Stripe invoice payment fails, alerts the billing channel in Slack and emails the customer a friendly retry notice.

On a paid Stripe invoice, emails the customer a thank-you and appends the payment to a Google Sheets log.