The latest PubSub+ version 9.13.0.16 added support for Amazon Signature V4, now we can integrate with AWS services without using API Gateway. But I could not find any document or guide on the configuration, so I did a test to integrate with S3 and it works. I have captured the steps and screenshots into a file for your reference.
Wow this is awesome! Thank you very much @yangsen and glad it worked for you 
Thank you this is awesome!
In Release 10.1.0, we have a new click to connect wizard to make this even faster! Check it out on Solace connector hub at: PubSub+ Click to Connect for Amazon S3
Good improvement!!
Hi all, Maybe @rtomkins in particular
Thought would tag onto this thread as asking about Solace → S3 connection properties…
It works perfectly for a string data set, but fails to populate data if we send a dictionary…
Any idea what settings we need to change/adapt to be able to send dictionary/json data to s3 ?
Did wonder about headers, such as ContentType = application/json etc but this made no difference.
Thank you