These informations given me. How can use this service?

The XML API Overview
To send API requests to Encoding.com, please send HTTP(S) post requests to manage.encoding.com. All client requests and server responses use the XML format. Clients must send the HTTP(S) POST request with a single parameter named xml. The server response will be a normal XML document

Sending different messages with different numbers:

http://sms.ayyildiz.net/MultiSender.aspx

<?xml version="1.0" encoding="ISO-8859-9"?>
<MainmsgBody>
<UserName>user</UserName>
<PassWord> pass</PassWord>
<Version>xVer.2.0</Version>
<Originator>TEST</Originator>
<Messages>
<Message>
<Mesgbody> ODEME TUTARINIZ 200 t.</Mesgbody>
<Number>905552683525</Number>
 </Message>
<Message>
<Msgbody> ODEME TUTARINIZ  10.</Msgbody>
<Number>905555</Number>
</Message>
</Messages>
<SDate></SDate>
<EDate></EDate>
</MainmsgBody>