My developer is trying to find out how to obtain/access groupdocs.compress API which is demonstrated on Compress documents online | Free GroupDocs Apps
Any guides or documentation would be helpful!
Unfortunately, we do not have a dedicated product to handle compression.
Some of GroupDocs products support compression, e.g. GroupDocs.Viewer can compress PDF files - see Optimize the output PDF file topic.
Please share what types of files you would like to compress.