SynergyWholesale Soap API balance using curl

#!/usr/bin/env bash
# swbalance 20180623 - 20180623
# Copyright (C) 1995-2018 Mark Constable <markc@renta.net> (AGPL-3.0)

# apt install libxml2-utils

#SW_RESELLERID=YOUR_RESELLER_ID
#SW_APIKEY=YOUR_API_KEY

XMLREQF=$(mktemp)
XMLRESF=$(mktemp)

cat << EOS > $XMLREQF
<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:ns2="http://xml.apache.org/xml-soap" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
  <SOAP-ENV:Body>
    <ns1:balanceQuery>
      <param0 xsi:type="ns2:Map">
        <item>
          <key xsi:type="xsd:string">resellerID</key>
          <value xsi:type="xsd:string">$SW_RESELLERID</value>
        </item>
        <item>
          <key xsi:type="xsd:string">apiKey</key>
          <value xsi:type="xsd:string">$SW_APIKEY</value>
        </item>
      </param0>
    </ns1:balanceQuery>
  </SOAP-ENV:Body>
</SOAP-ENV:Envelope>
EOS

curl -s --header "Content-Type: text/xml;charset=UTF-8" \
 --header "SOAPAction: balanceQuery" \
 --data @$XMLREQF \
 https://api.synergywholesale.com/?wsdl > $XMLRESF

rm $XMLREQF
SW_BALANCE=$(xmllint --xpath "//*[local-name()='balance']/text()" $XMLRESF)
rm $XMLRESF

echo "Your balance is: $SW_BALANCE"