# Revenue reporting

## Implementation

Since version **1.7.0**, apps can receive an estimated revenue that has likely been generated by an ad.

To do this, it is just needed to implement the corresponding listener for each ad format, as shown in the example below:

```dart
BannerAd(
  ...
  listener: (event, args) {
    if (event == BannerAdEvent.REVENUE_PAID) {
      // El anuncio ha sido generado un ingreso
    }
  },
)
```

The listener receives an object as argument that contains the following fields:

<table><thead><tr><th width="139.62109375">Field</th><th width="175.20703125">Type</th><th>Description</th></tr></thead><tbody><tr><td><code>revenue</code></td><td><code>Map</code></td><td>The revenue generated by the ad</td></tr><tr><td><code>source</code></td><td><code>String</code></td><td>The revenue source</td></tr></tbody></table>

In addition, the `revenue` object contains the following fields that represent the revenue:

<table><thead><tr><th width="140.49609375">Field</th><th width="175.171875">Type</th><th>Description</th></tr></thead><tbody><tr><td><code>currency</code></td><td><code>String</code></td><td>The currency corresponding to the revenue</td></tr><tr><td><code>precision</code></td><td><code>String</code></td><td>The accuracy of the information. It can be <code>ESTIMATED</code>, <code>PRECISE</code> or <code>PUBLISHER_DEFINED</code></td></tr><tr><td><code>value</code></td><td><code>double</code></td><td>The revenue value</td></tr></tbody></table>

## Integration with Firebase

Below, a basic example is shown of how to report the revenue information to Firebase:

```dart
final analytics = FirebaseAnalytics();

BannerAd(
  ...
  listener: (event, args) {
    if (event == BannerAdEvent.REVENUE_PAID) {
      analytics.logEvent(
        name: 'ad_revenue',
        parameters: {
          'currency':  args['revenue']['currency'],
          'precision': args['revenue']['precision'],
          'source':    args['source'],
          'value':     args['revenue']['value'],
        },
      );
    }
  },
)
```