I have never worked with another Third Party System before that prefers to push data to me than provide an API to just pull that data down as needed - but they have their reasons they say!
On that basis they say they typically use a basic method of the client providing a form to which they post the data each time. Now this means they post direct to the form submission URL - so my initial thought was channel forms - but then i remembered XSS and how this will prevent it. So is there a way to disable XSS token checks specifically for a single form, or just site wide (which i would prefer to avoid).
If not - i will use addon to create a REST api on the EE end and get them to submit to that. Does anyone have any experience with such a addon as: http://docs.reinos.nl/webservice/#introduction