Account Invoice Subscription per contact

This module adds a new notification type called "Invoice Created" that you can subscribe contacts to. It works on customer and vendor contacts (res.partner).

When an invoice (account.move) is created or its customer is changed, Odoo looks at the contact on the invoice and its parent company. Any contact subscribed to the "Invoice Created" notification is automatically added as a follower of that invoice, so they receive the invoice-related messages.

• The new notification appears in the contact's subscription settings, where you can tick it for the people who should be informed.
• It is not enabled by default, so nothing changes until you subscribe someone.
• The subscription is inherited from the contact and its commercial (parent) contact, so a subscription on the company also applies to its child contacts.

This is useful when the main contact's email is not the right recipient, or when colleagues need to be kept informed about a specific customer's invoices without following all sales activity. The module only touches the accounting area (account.move) and contacts (res.partner); it does not add menus or reports of its own.