@james.irlbeck you have to review this topic:
As far as I know, it is mandatory for any user to read it, understood it and accept it.
For the rest, the answer was already provided.
You have to find a way to bring the needed AWS SDK jars in your project and write the needed auth and requests API wrappers.
Once you have them, you can plugg them into Katalon testcases through a custom keyword class (or even a custom plugin)
Katalon does not provide such at this moment so you have to develop your own solution.
Therefore, start coding.
Show to us what you did and where you are stuck and perhaps we can guide you further.
Cheers!
bionel