Invoice Events

Invoice notifications enable seamless integration between OpenMeter and external systems by providing real-time updates on invoice state changes. Key applications include:

• Automated response handling for overdue or uncollectible invoices
• Immediate notification of invoice validation exceptions
• Enterprise integration with third-party invoicing and payment solutions through the Custom Invoicing App

Please note that notifications for Gathering Invoices are currently not supported. If this functionality is critical for your implementation, we encourage you to reach out to our support team to discuss your requirements.

#Invoice notifications

To receive invoice notifications, follow these steps:

#Rules

OpenMeter supports two types of invoice notification rules:

• invoice.created: Triggered when a new invoice is generated
• invoice.updated: Triggered when an existing invoice's state changes

These rules are configured without additional parameters and will capture all invoice-related events in the system.

Note: As mentioned previously, notifications for Gathering Invoices are not currently supported.

#Events

The structure of invoice events aligns with the Get Invoices API endpoint response, encapsulated within a standardized event envelope.

Example event:

{
  "id": "01JSJ98SQWRQXEER4PZNQ5PX26",
  "timestamp": "2025-04-23T21:36:09.468991Z",
  "type": "invocing.invoice.updated",
  "data": {
    // fully expanded invoice
  }
}

An invoice event is generated for each state transition of the invoice (e.g. draft.created -> draft.sync). Please check the relevant documentation on Invoice Lifecycle on interpreting the invoice states.