We can get Document ID once we upload the files to UCM using Erpintegrations REST API as shown below:

We can get UCM id from this document ID using generic SOAP WSDL with the details below:

WSDL:

Method:

GenericSoapOperation

Request:

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ucm="http://www.oracle.com/UCM">
     <soapenv:Header/>
     <soapenv:Body>
        <ucm:GenericRequest webKey="cs">
           <ucm:Service IdcService="GET_FILE">
              <ucm:Document>
                 <ucm:Field name="dID">2700074</ucm:Field>
              </ucm:Document>
           </ucm:Service>
        </ucm:GenericRequest>
     </soapenv:Body>
  </soapenv:Envelope>

Response: