Who can help to deal with SOAP Client in php?

Question

PHP

Hello colleagues!
Please help me figure out SoapClient in php.
There is a server, there is no WSDL (SOAP-ENV)
There is a specified schema.
Request example:

<?xml version="1.0" encoding="utf-8"?> 
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ei="http://schemas.compassplus.com/mc/checkout.xsd"> 
<SOAP-ENV:Header/> 
<SOAP-ENV:Body> 
<ei:Request Language="RU" Challenge="f21ce99afd7c1883" PwdHashBlock="65EFB770FD7EEACE259FC7ECF36C8BF1A96B1C17"> 
<ei:Login>user1</ei:Login> 
<ei:CheckLogin/> 
</ei:Request> 
</SOAP-ENV:Body> 
</SOAP-ENV:Envelope>

Answer example:

<?xml version="1.0" encoding="utf-8"?> 
<SOAP-ENV:Envelope xmlns:SOAP-ENV=”http://schemas.xmlsoap.org/soap/envelope/” xmlns:ei="http://schemas.compassplus.com/mc/checkout.xsd"> 
<SOAP-ENV:Header/> 
<SOAP-ENV:Body> 
<ei:Response Result="Approved" Rrn="14043012340677"/> 
</SOAP-ENV:Body> 
</SOAP-ENV:Envelope>

There is also an address of the form: 192.12.2.1:5000
Questions:
1. What should be the location and uri? And what are their differences?
2. How to pass ei:Request with parameters to request?
3. How to pass ei:Login and ei:CheckLogin?
Whoever can will be very grateful!
Thanks everyone for the replies.