public function read( &$customer ) {
		$data = (array) WC()->session->get( 'customer' );

		/**
		 * There is a valid session if $data is not empty, and the ID matches the logged in user ID.
		 *
		 * If the user object has been updated since the session was created (based on date_modified) we should not load the session - data should be reloaded.
		 */
		if ( isset( $data['id'], $data['date_modified'] ) && $data['id'] === (string) $customer->get_id() && $data['date_modified'] === (string) $customer->get_date_modified( 'edit' ) ) {
			foreach ( $this->session_keys as $session_key ) {
				if ( in_array( $session_key, array( 'id', 'date_modified' ), true ) ) {
					continue;
				}
				$function_key = $session_key;
				if ( 'billing_' === substr( $session_key, 0, 8 ) ) {
					$session_key = str_replace( 'billing_', '', $session_key );
				}
				if ( isset( $data[ $session_key ] ) && is_callable( array( $customer, "set_{$function_key}" ) ) ) {
					$customer->{"set_{$function_key}"}( wp_unslash( $data[ $session_key ] ) );
				}
			}
		}
		$this->set_defaults( $customer );
		$customer->set_object_read( true );
	}