jobs, with current state info; for all states of a given job, follow the JobHistory link;
rql-able fields are currentstate: jobstate, reason, enteredstatedateutcall; jobinfo: all but threeplidentifier.id, methodparams, tracemessages
only the == rql operator is supported for jobinfo.customerid, methodname, registeredbyjobid and threeplidentifier.guid;
so to perform the equivalent of =in= do the following: rql=...(jobinfo.customerid==5,jobinfo.customerid==6,jobinfo.customerid==9)...
Hint: example GET for determining if job is already scheduled (as used by HH enqueueing machinery):
/jobs?pgsiz=1&rql=jobinfo.methodname==mmm;currentstate.jobstate=in=(1,2,3);jobinfo.threeplidentifier.guid==ggg&methodparams=a|b|c
Hint: methodParams value must be cognizant of strings containing backslashes; for example, for C:\hh\2 pass in "C:\\\\hh\\\\2"
the surrounding quotes because it's a string, the backslashes quadrupled because of json encoding
no need to take my word for it -- see what hangfire stores in its job.arguments column and reason it out
Success status: 200

{
  "totalResults": 1,
  "_embedded": {
    "http://api.3plCentral.com/rels/jobs/job": [
      {
        "jobInfo": {
          "retries": 1,
          "recurringJobName": "str",
          "jobId": 2,
          "threePlIdentifier": {
            "guid": "str",
            "name": "str",
            "id": 3
          },
          "customerId": 1,
          "registeredByJobId": 1,
          "methodName": "str",
          "methodParams": [
            "str"
          ],
          "traceMessages": [
            "str"
          ],
          "createdAt": "2016-12-25T23:00:00",
          "expireAt": "2016-12-25T23:00:00"
        },
        "currentState": {
          "jobState": 1,
          "reason": "str",
          "enteredStateDateUtc": "2016-12-25T23:00:00",
          "enqueuedQueue": "str",
          "scheduledEnqueueAt": "2016-12-25T23:00:00",
          "processingServerName": "str",
          "processingWorkerName": "str",
          "succeededElapsedMilliseconds": 1,
          "failedExceptionType": "str",
          "failedMessage": "str",
          "failedStackTrace": "str"
        }
      }
    ]
  }
}