Shipping Method Configuration not showing

-- HikaShop version -- : 2.4.0
-- Joomla version -- : 3.4.1
-- PHP version -- : 5.3.10
-- Browser(s) name and version -- : Firefox 38.0.5

I'm creating a custom shipping method plugin and I can't get the "_configuration.php" file to show up when I go into edit mode.

Things I've done:

• INamed the configuration file "gls_configuration.php"
• Filled out the "onShippingConfiguration" function and pretty much copied the UPS version.
• Filled out the "onShippingConfigurationSave" function.

Okay I figured it out. Again, the lack of documentation is costing hours.

I found out that when you want a Specific Configuration for the plugin, you have to choose between:
1) Using a class variable $pluginConfig.
(examples: AUPost, USPS)
OR
2) Using a PLUGINNAME_configuration.php file
(examples: CANPar, Envoimoinscher, Fedex)

I was using both, so the code chose the first one, which I made to be empty. Thus, nothing showed.
The purpose of $pluginConfig wasn't documented anywhere so I could only guess what it was for.