I do something very similar..

You can do it in a script connector like this

<!-- Read XML which is the response from DigiHaul shipment-listing -->
<arc:set attr="input.uri" value="[FilePath]"/>
<arc:call op="xmlOpen" input="input">
  <arc:set attr="xml.handle" value="[handle]" />
</arc:call>
<arc:set attr="xml.map:shipmentNumber" value="/Shipments/records/shipmentNumber"/>
<arc:set attr="xml.map:jobId" value="/Shipments/records/jobId"/>

<arc:try>
  <arc:call op="xmlDOMGet" in="xml" out="out1">
    <arc:set attr="data.shipmentNumber" value="[out1.shipmentNumber]"/>
    <arc:set attr="data.jobId" value="[out1.jobId]"/>
  </arc:call>

<!-- Log Information -->
<arc:set attr="_log.info">
shipmentNumber = [data.shipmentNumber]
jobId = [data.jobId]
</arc:set>


<!-- fetch Shipment Details from DigiHaul -->
<arc:set attr="http.URL" value="https://api.domain.com/carrier/api/shipment-listing/[data.jobId]" />  
<arc:set attr="http.header:name#" value="Authorization" />
<arc:set attr="http.header:value#" value="Bearer XXXXXXXX"/>

<arc:set attr="http.verbosity" value="5"/> 
<arc:set attr="http.logfile" value="D:\cData\logs\my.log"/> 


<arc:set attr="_log.info">
Auth = [http.header:*]
URL = [http.URL]  
</arc:set>  

<arc:call op="httpGet" in="http">
  <arc:set attr="output.data" value="[http:content]" />
</arc:call>

<arc:set attr="_log.info">
Response = [output.data]
</arc:set>    

<arc:set attr="output.filename" value="dh-fetch-order-[data.shipmentNumber].json" />
<arc:set attr="output.Header:shipmentNumber" value="[data.shipmentNumber]" />
<arc:set attr="output.Header:jobId" value="[data.jobId]" />


    <arc:finally>
    <arc:call op="xmlClose" input="xml"/>
  </arc:finally>
</arc:try>

Use xmlOpen and xmlDOMGet to extract the ID or the parameter you need

Set the http.URL using your parameter

Then use a HTTPGet to call your endpoint

hope that helps