It would be great to have an ability to manage Customer Groups. Without this ability customer groups have to be created either manually or via scripts.

https://docs.commercetools.com/http-api-projects-customerGroups

Description

The parameters "newProductVariant" and "oldProductVariant" should be renamed to "sourceProductVariant" and "targetProductVariant ". So it`s much more straight foreward to old and New.
But now this (old and new) is used as a convention across the whole library and is not so easy to do without wasting some time.