$shipping_address = [
                    'first_name' => isset( $first_name ) ? $first_name : '',
                    'last_name'  => isset( $last_name ) ? $last_name : '',
                    'address_1'  => isset( $shipping_address_data['address1'] ) ? $shipping_address_data['address1'] : '',
                    'address_2'  => isset( $shipping_address_data['address2'] ) ? $shipping_address_data['address2'] : '',