Rest API help

Rest API help

Hello, I would like to use Rest API for creating requesters. When I execute code below in Powershell, I get message "No XML data specified". What's incorrect here?

  1. $inputdata = @"
    <?xml version="1.0" encoding="UTF-8"?>
    <API version="1.0" locale="en">
        <records>
        <record>
            <parameter><name>Name</name><value>testfromapi</value></parameter>
            <parameter><name>CI Type</name><value>Requester</value></parameter>
            <parameter><name>Site</name><value>Common site</value></parameter>
            <parameter><name>Business Impact</name><value>Medium</value></parameter>       
            <parameter><name>Description</name><value>New user joined</value></parameter>
            <parameter><name>Employee ID</name><value>1111</value></parameter>
            <parameter><name>E-mail</name><value>test@my.address</value></parameter>
            <parameter><name>Phone</name><value>11111</value></parameter>
            <parameter><name>Mobile</name><value>11111111</value></parameter>
            <parameter><name>Department Name</name><value>Finance</value></parameter>
            <parameter><name>Department's site</name><value>Test</value></parameter>
            <parameter><name>Job title</name><value>Testtitle</value></parameter>       
        </record>
        </records>
    </API>
    "@


    $URI = "http://servicedesk.domain.local:8080/api/cmdb/ci"
    $postParams = @{OPERATION_NAME='Add';TECHNICIAN_KEY='my_api_key';INPUT_DATA=$inputdata}
    Invoke-WebRequest -Uri $URI -Method POST -Body $postParams