Need a programmer to create the XML and connect it to the portals (MODX)

Need to do for our XML objects, you can only make the sale of real estate and can only be done in one city or all cities.
We want to add their properties on portals, for example, Prian, Homesoverseas, Domaza, Bazaraki they have a function to load objects via XML

Have all manuals for connecting to the portals

(MODX)