You might be able to use AutoHotKey rather than looking for an AI agent.

https://www.autohotkey.com/

https://github.com/raeleus/AHK-Macro-Recorder

Good recommendation. I see there’s others using this as well for this type of task, but it’s not fully automated. They got it to the point where it detects PDFs of shipping labels and automatically prints, but not the purchasing part.