I am getting the error ""Invalid API key. Make sure you selected the correct region. Also, follow this instruction..." when using the REST API. I followed the API creation instructions to create a Test key.
I see this from 6 months ago, but it refers to Power Automate, which I am not using. I am hitting the API with the requests module in Python. I do see in my account details that I am in the US region.
I was able to get this working by using "https://us-api.plumsail.com/api/v2" as my base URL. Note the "us-api" instead of "api".
This seems like a simple thing that should be in the docs.