Every kind of item can be created, updated or destroyed with three supported Content-Type formats: XML, JSON and Form-Encoded. The following example of creating web site activity for a contact demonstrates each format.
XML
<?xml version="1.0" encoding="utf-8"?>
<request>
<parent>{parentId}</parent>
<data>
<caption>website created from api</caption>
<url>http://test.site.com</url>
</data>
</request>
JSON
{"parent":"{parentId}","data":{"caption":"website created from api","url":"http:\/\/test.site.com"}}
Form-encoded (provided by html form)
parent={parentId}&data%5Bcaption%5D=website+created+from+api&data%5Burl%5D=http%3A%2F%2Ftest.site.com