Poc/apiimport2.0

I would draw your attention on this method which is duplicate with VariantGroupHelper
https://github.com/akeneo/MagentoConnectorBundle/compare/2.0...poc/apiimport2.0?expand=1#diff-6a49e8e7b32d7ee80a0267bf717b57f5R116
https://github.com/akeneo/MagentoConnectorBundle/blob/poc/apiimport2.0/Normalizer/VariantGroupHelper.php#L108

Those class share nothing else than this method, is it possible to create an abstract or something ?
No, you check if the product belongs to the category used by the channel. If you passed the channel, you could have this kind of naming, if you pass only the category, this name doesn't make any sense.