Updating existing contact name details using API
To update an existing contact simply add to the XML post data specifying the system ContactID to update:
<contact>
<field table="CONT" field="CID">1234</field>
<field table="CONT" field="CONTACT">Test 33</field>
<field table="CONT" field="EMAIL">test@aaa.com</field>
</contact>
Click here to go to the create Account API code.