POST https://grouperWs.school.edu/grouper-ws/servicesRest/2.6.0/gshTemplateExec
Content-Type: application/json
Authorization: sas9f8d7sa9df87asd98f

{
  "WsRestGshTemplateExecRequest":{
    "ownerStemLookup":{
      "stemName":"penn:etc:templates:membershipCount"
    },
    "ownerType":"stem",
    "configId":"membershipCount",
    "wsInput": {},  // new in v4.9.4+ and v5.6.1+. arbitrary input based on the template and its needs
    "inputs":[
      {
        "name":"gsh_input_groupName",
        "value":"test:testGroup"
      }
    ]
  }
}

RESPONSE
STATUS: 200
x-grouper-resultcode: SUCCESS
x-grouper-resultcode2: NONE
x-grouper-success: T
{
   "WsGshTemplateExecResult":{
      "resultMetadata":{
         "success":"T",
         "resultCode":"SUCCESS",
         "resultMessage":"Success for: clientVersion: 2.6.0, configId: membershipCount, ownerType: stem , inputs: Array size: 1: [0]: edu.internet2.middleware.grouper.ws.coresoap.WsGshTemplateInput@106d7e5e\n\n, actAsSubject: null, paramNames: \n, params: null"
      },
      "gshOutputLines":[
         {
            "messageType":"success",
            "text":"{\"totalMembershipCount\":3,\"immediateMembershipCount\":3}"
         }
      ],
      "responseMetadata":{
         "serverVersion":"2.5.55",
         "resultWarnings":", Client version: 2.6.0 is greater than (major/minor) server version: 2.5.55, Client version: 2.6.0 is greater than (major/minor) server version: 2.5.55",
         "millis":"4046"
      },
      "gshValidationLines":[
         
      ],
      "transaction":true
   }
}