'POST' \  'http://yourdomain.com/api/rest/contact/get' \
{
  "type": "EMAIL",
  "value": "j.mcexample@example.com"
}'
JS 
<soapenv:Envelope
    xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"
    xmlns:ecm="http://yourdomain.com/developer/ecmapi">
    <soapenv:Header/>
    <soapenv:Body>
        <ecm:contactGet>
            <identifier>
                <type>EMAIL</type>
                <value>j.mcexample@example.com</value>
            </identifier>
        </ecm:contactGet>
    </soapenv:Body>
</soapenv:Envelope>
JS

Response

Description

200From this request, you should receive a 200 response, with information about the contact. This includes information like their contactID.
400If the profile does not exist you will receive a 400 response. You can also double-check the email used in the call if you believe there is an existing user profile.