How to POST data to XML web service

Hi, I’d like to pass data (a combination of geo address and multiple choice selections) from bubble to a web service (XML POST, credentials are part of xml parameter, which is url-encoded). I have no idea how to get started on that and most of what I can find online or here on the forum does not deal with that use case. How do I set up the API connector such that it accepts form data from my app dynamically? I have the call working in Insomnia but don’t know how to translate that to bubble and how to set up dynamic inputs. Thanks!