Convert PHP SOAP call to Postman - php

Question

I am trying to make a SOAP call using POSTMAN that will duplicate a call I'm making with a PHP code for testing purposes, but I am getting a "Bad request" error message, so I assume my conversion is incorrect.
The PHP code is:
//Create xml string
$xml=new DomDocument();
$xml->createCDATASection('![CDATA[]]');
$xml->encoding = 'utf-8';
$xml->xmlVersion = '1.0';
$xml->formatOutput = true;
$xsd=$xml->createElement("xsd:schema");
$xml->appendChild($xsd);
$xsdattr=new DOMAttr("xmlns:xsd","http://www.w3.org/2001/XMLSchema");
$xsd->setAttributeNode($xsdattr);
$ZHT=$xml->createElement("ZHT",str_replace(" ","",$username));
$xsd->appendChild($ZHT);
$PASSWORD=$xml->createElement("PASSWORD",str_replace(" ","",$pwd));
$xsd->appendChild($PASSWORD);
$SNL=$xml->createElement("SNL",$date);
$xsd->appendChild($SNL);
$USERNAME=$xml->createElement("USERNAME","");
$xsd->appendChild($USERNAME);
$RETHASIMA=$xml->createElement("RETHASIMA","1");
$xsd->appendChild($RETHASIMA);
$LANG=$xml->createElement("LANG","");
$xsd->appendChild($LANG);
$ROLE=$xml->createElement("ROLE",$role);
$xsd->appendChild($ROLE);
$xmlstring=$xml->saveXML();
//Set SOAP request
$baseURL=$url;
$arrContextOptions=array("ssl"=>array( "verify_peer"=>false, "verify_peer_name"=>false,'crypto_method' => STREAM_CRYPTO_METHOD_TLS_CLIENT));
$options = array(
'soap_version' => SOAP_1_1,
'trace' => true,
'exceptions' => true, // disable exceptions
'features' => SOAP_SINGLE_ELEMENT_ARRAYS,
'encoding' => 'UTF-8',
'cache_wsdl'=>WSDL_CACHE_NONE,
);
$client = new SoapClient($baseURL."?wsdl", $options);
$p=array(
"P_RequestParams" => array (
"RequestID"=>"48",
"InputData"=>$xmlstring
) ,
"Authenticator" => array (
"Password"=>$authpass,
"UserName"=>$authuser
),
);
//SOAP call and response
$response=$client->ProcessRequestJSON($p);
And This is the body I created in POSTMAN:
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Body>
<ProcessRequestJSON xmlns="****">
<P_RequestParams>
<RequestID>48</RequestID>
<InputData>
<?xml version="1.0" encoding="utf-8" ?>
<schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<PARAMS>
<ZHT>****</ZHT>
<PASSWORD>****</PASSWORD>
<SNL>***</SNL>
<USERNAME></USERNAME>
<RETHASIMA>1</RETHASIMA>
<LANG></LANG>
<ROLE>1</ROLE>
</PARAMS>
</schema>
</InputData>
</P_RequestParams>
<Authenticator>
<UserName>****</UserName>
<Password>****</Password>
</Authenticator>
</ProcessRequestJSON>
</soap:Body>
</soap:Envelope>
I'm not sure how to set certain things on POSTMAN.
For example, the following line:
$xsdattr=new DOMAttr("xmlns:xsd","http://www.w3.org/2001/XMLSchema");
How do I set a DOMAttr in POSTMAN?
Or the options?
I set up the headers for XML:
Content-Type: text/xml
SOAPAction: "****/ProcessRequestJSON"
Body: Raw (XML)
I tried putting the inner XML (inside the tag) in "" to indicate a string, but that didn't work either.
The PHP code works correctly, the SOAP call is successful and returns a correct response.
The POSTMAN request returns a "Bad Request" error message.