We are receiving a gzipped file from a SOAP call in IS. Is there a way to gunzip this file in flow?
There is no such service OOTB.
But you can check the TechCommunity Samples and Downloads section for a package named PSUtilities.
This one has services for zipping and unzipping files, but I am not sure if this will work with gzip format.
On the other side you can try to unzip it in filesystem by using pub.utils:executeOSCommand specifying the command as “gzip -d zip-file” and then read in the files by using services from folder pub.file.