v1.1.1 fails compilation

[craigfleming]

@taehyunlim and @kkong87 - The latest version of this extension (v1.1.1) fails when compiling code on a v2.4.5-p2 Magento system.

Recompiling code (background)
Compilation was started.
Repositories code generation... 1/9 [===>------------------------]  11% 1 sec 203.0 MiBsyntax error, unexpected '|', expecting ';' or '{'#0 /var/www/html/vendor/composer/ClassLoader.php(428): Composer\Autoload\includeFile('/var/www/html/v...')
#1 [internal function]: Composer\Autoload\ClassLoader->loadClass('Affirm\\Telesale...')
#2 [internal function]: spl_autoload_call('Affirm\\Telesale...')
#3 /var/www/html/setup/src/Magento/Setup/Module/Di/Code/Reader/ClassesScanner.php(134): class_exists('Affirm\\Telesale...')
#4 /var/www/html/setup/src/Magento/Setup/Module/Di/Code/Reader/ClassesScanner.php(117): Magento\Setup\Module\Di\Code\Reader\ClassesScanner->includeClass('Affirm\\Telesale...', '/var/www/html/v...')
#5 /var/www/html/setup/src/Magento/Setup/Module/Di/Code/Reader/ClassesScanner.php(87): Magento\Setup\Module\Di\Code\Reader\ClassesScanner->extract(Object(RecursiveIteratorIterator))
#6 /var/www/html/setup/src/Magento/Setup/Module/Di/App/Task/Operation/RepositoryGenerator.php(61): Magento\Setup\Module\Di\Code\Reader\ClassesScanner->getList('/var/www/html/v...')
#7 /var/www/html/setup/src/Magento/Setup/Module/Di/App/Task/Manager.php(56): Magento\Setup\Module\Di\App\Task\Operation\RepositoryGenerator->doOperation()
#8 /var/www/html/setup/src/Magento/Setup/Console/Command/DiCompileCommand.php(216): Magento\Setup\Module\Di\App\Task\Manager->process(Object(Closure), Object(Closure))
#9 /var/www/html/vendor/symfony/console/Command/Command.php(255): Magento\Setup\Console\Command\DiCompileCommand->execute(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#10 /var/www/html/vendor/symfony/console/Application.php(1021): Symfony\Component\Console\Command\Command->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#11 /var/www/html/vendor/symfony/console/Application.php(275): Symfony\Component\Console\Application->doRunCommand(Object(Magento\Setup\Console\Command\DiCompileCommand), Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#12 /var/www/html/vendor/magento/framework/Console/Cli.php(116): Symfony\Component\Console\Application->doRun(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#13 /var/www/html/vendor/symfony/console/Application.php(149): Magento\Framework\Console\Cli->doRun(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#14 /var/www/html/bin/magento(23): Symfony\Component\Console\Application->run()
#15 {main}