public function get_top_sellers_report( $fields = null, $filter = array() ) {

		// check user permissions
		$check = $this->validate_request();

		if ( is_wp_error( $check ) ) {
			return $check;
		}

		// set date filtering
		$this->setup_report( $filter );

		$top_sellers = $this->report->get_order_report_data( array(
			'data' => array(
				'_product_id' => array(
					'type'            => 'order_item_meta',
					'order_item_type' => 'line_item',
					'function'        => '',
					'name'            => 'product_id',
				),
				'_qty' => array(
					'type'            => 'order_item_meta',
					'order_item_type' => 'line_item',
					'function'        => 'SUM',
					'name'            => 'order_item_qty',
				),
			),
			'order_by'     => 'order_item_qty DESC',
			'group_by'     => 'product_id',
			'limit'        => isset( $filter['limit'] ) ? absint( $filter['limit'] ) : 12,
			'query_type'   => 'get_results',
			'filter_range' => true,
		) );

		$top_sellers_data = array();

		foreach ( $top_sellers as $top_seller ) {

			$product = wc_get_product( $top_seller->product_id );

			if ( $product ) {
				$top_sellers_data[] = array(
					'title'      => $product->get_name(),
					'product_id' => $top_seller->product_id,
					'quantity'   => $top_seller->order_item_qty,
				);
			}
		}

		return array( 'top_sellers' => apply_filters( 'woocommerce_api_report_response', $top_sellers_data, $this->report, $fields, $this->server ) );
	}