I have done it… but the code is in no shape to just give you… give me a few weeks to get some other stuff done and I might be able to do that.
In the meantime if you want to give it a try: AWS uses oAuth… so look for examples… I use the MBS SHA1MBS & CURLSMBS but you can probably do it with pure Xojo code… MBS has an oAuth example using Twitter that is a good place to start.
You will also need to set up a User using AWS IAM service and obtain an Access Key ID and Secret Key for that User.