protected function get_customer_billing_address() {
		$billing_address = apply_filters( 'woocommerce_api_customer_billing_address', array(
			'first_name',
			'last_name',
			'company',
			'address_1',
			'address_2',
			'city',
			'state',
			'postcode',
			'country',
			'email',
			'phone',
		) );

		return $billing_address;
	}