src/XQueue/Maileon/API/Contacts/SynchronizationMode.php
static function init()
    {
        if (self::$initialized == false) {
            self::$UPDATE = new SynchronizationMode(1);
            self::$IGNORE = new SynchronizationMode(2);
            self::$initialized = true;
        }
    }
static function init()
    {
        if (self::$initialized == false) {
            self::$UPDATE = new SynchronizationMode(1);
            self::$IGNORE = new SynchronizationMode(2);
            self::$initialized = true;
        }
    }
This is the initialization method for the synchronization modes. This must be called once in the beginning.