Python is really good at calling APIs, and it actually gives you alle the functionality you need to call APIs no matter encryption method and format. I would be happy to see libraries like the following supported in PBI Service: - requests - hashlib - hmac - base64 - datetime - time - xml.etree.cElementTree requests enable you to call almost any type of APIs, and the other libraries are really handy (and often mandatory) for encoding/decoding and formatting. Unfortunately, I would not be able to do all this in Power Query SDK, and I don't see why you would continue developing this when you already have such a good alternative out there 🙂