Cs-cart versions

I’ve been looking to the cs-cart documentation regarding the previous versions of cs-cart. and the only versions available in the documentation where from 4.0.x and above. So I was wondering if i can find somewhere the documentation for previous versions. Also I would like to ask if anyone knows if the api for cs-cart is available in all of his versions or if it is available only from the version 4.0.x and above.

Thank you

REST API is available from version 4 >

Best regards

Unfortunately, documentation for versions older than 4.0.1 is no longer available.