Hello,

Some time ago i had to use a REST API with a XML request and couldn´t find much info about it in OS foruns so i decided to do this quick guide so if anyone finds themself in the same position can follow it, this consists in a few easy steps:
First of all you need to consume a REST API with method set to POST and add a Content-Type header as it is in the following image:

On the method properties you just have to set the Request Format to Text.

After this you just have to create the XML request your API needs, for example the one we use:

The only Thing left is to set the new imput of the Rest Api method (ContentType) equal to 

"content-type: application/xml"

As seen in the following image:

And that is basicly all the steeps you need to follow,
If anyone has or had the same problem and need more help just ask :)
Best Regards,
Francisco Freire