[qualiteam]

As far as I see the most recent version still uses the same \XLite\Model\Shipping\Processor\AProcessor base class for integrating with shipping services, and getRates() method is still the one that returns the list of available shipping methods, however now it has a default implementation that works this way:
- it calls prepareInputData() to translate the order data into the data to be sent to the carrier's server
- then it calls performRequest() to perform the request to the carrier's server and returns an array of \XLite\Model\Shipping\Rate
- finally, it calls the postProcessRates() to do some extra work over the rates

I guess you are to implement these methods in your custom shipping carrier module. However, you are not forced to follow this logic - for example, the existing free AustraliaPost module has its own getRates() method.

Anyway, I think the tutorial should work for 5.3 too. What problems did you face when following the tutorial? What didn't work?