All command calls and errors are logged in::

/usr/local/mgr5/var/phpcomposerctl.log
PHP

To configure the logging level phpcomposerctl, you need to add the line to the configuration file /usr/local/mgr5/etc/debug.conf, for example:

phpcomposerctl.*        9
PHP

The setting of the PHP Composer logging level for the module inside the panel is specified in the configuration file for the php module.