Using XML API as data source

Have you been able to get this to work?

I am trying something similar(March 2019), but I just cannot figure out how to pass an XML body correctly within the request to get back an authentication token(I need to send credentials or something similar). I tried a lot of stuff, but i keep getting invalid XML or when I use Text.ToBinary it gives me the error of text could not be converted to binary(or the other way).

I kind of stopped trying for the moment, but there must be a way. I cannot sleep with the thought that Power BI cannot make a Post request to an XML API, sending a XML body within the request, with credentials or something else.

I have experience as a programmer. But not with Power BI and or Power Query and the language it uses(M).

Therefor it could be me. I hope you fixed your problem.

An example of what I am trying to pass in the request to an API URL:

<request>
 <client>xxxx</client>
 <username>xxxx</username>
 <password>xxxx</password>
</request>

This returns a response with a token and a time(see below).

<response>
 <valid>yes</valid>
 <token>xxxx</token>
 <validUntil>xxxx</validUntil>
</response>

The reason I am doing this within power bi, is because the rest of the requests(when i have the token) are also post-requests, which need to send a XML body within the request.