Parameters:
Client XML structure example:
<root>
<item>
<group_id>2</group_id>
<firstname>Vārds</firstname>
<lastname>Uzvārds</lastname>
<email>[email protected]</email>
<phone>12345678</phone>
<newsletter>1</newsletter>
<newsletter_sms>0</newsletter_sms>
<status>1</status>
<custom_fields>
<!-- Nav obligāti -->
<field id="2" name="Uzņēmuma reģ nr.">7621346908335</field>
<field id="" name="Uzņēmuma pvn nr.">LV7621346908335</field>
<field name="Juridiskā adrese">Juridiska iela 5, Rīga</field>
<field name="Dzimšanas diena">1999-01-30</field>
</custom_fields>
<addresses>
<address>
<firstname>Vārds</firstname>
<lastname>Uzvārds</lastname>
<company>[email protected]</company>
<address_1>Adreses iela 7-1</address_1>
<address_2></address_2>
<city>Rīga</city>
<postcode>[email protected]</postcode>
<country id="117" code="LV">Latvia</country>
<region id="4163">Rīga</region>
<comment>komentārs</comment>
<custom_fields>
<field name="other custom field">some other custom field</field>
</custom_fields>
</address>
</addresses>
</item>
</root>