## Filter: wpd_alpha_insights_data_source_subscriptions

Filter the subscriptions entity data returned by the Subscriptions data source (WooCommerce Subscriptions) before it is stored in the data warehouse.

### Description

After the subscriptions data source builds its data (totals, data_by_date, etc.), this filter is applied. You can modify subscription metrics or add custom keys. The data warehouse then stores the returned value for the `subscriptions` entity. Requires the WooCommerce Subscriptions plugin.

#### Location

File: `includes/classes/data-sources/pro/WPDAI_Subscriptions_Data_Source.php`

Context: When returning subscriptions data from the data source.

### Parameters

Parameter | Type | Description
--- | --- | ---
$subscriptions_data | array | Subscriptions data structure (totals, data_by_date, total_db_records, etc.)
$data_warehouse | WPDAI_Data_Warehouse | The data warehouse instance

#### Return

Type: array

The (possibly modified) subscriptions data structure.

### Example Usage

#### Add a custom subscriptions metric

    add_filter( 'wpd_alpha_insights_data_source_subscriptions', 'add_subscriptions_custom_metric', 10, 2 );
    function add_subscriptions_custom_metric( $subscriptions_data, $data_warehouse ) {
        if ( isset( $subscriptions_data['totals'] ) && is_array( $subscriptions_data['totals'] ) ) {
            $subscriptions_data['totals']['mrr_estimate'] = 0; // Compute MRR from your logic
        }
        return $subscriptions_data;
    }

### Related

- Other data source filters: wpd_alpha_insights_data_source_sales, wpd_alpha_insights_data_source_store_profit