With over 400 different categories and subcategories it can get a little bit complicated understanding the XML Get Method which returns a list of categories.

The easiest way to understand this type of data is by looking at a Tree-View, which you may access at http://api.clickapost.com/categories.php.

After choosing your desired Top Category (say Real Estate) you will get a list of subcategories similar to the one below. Just remember, if any category you wish to post into has subcategories - you must post into one of the available subcategories. Posting directly into a category/subcategory which has "children" is not possible.