JSON for updating campaign

[Allen Fey]

I have a situation where I can not use one of the libraries so I am trying 
to figure out the JSON to update campaigns. I am able to use the query 
language to retreive data, but am getting caught on the mutate services.

For example, when I post the following JSON 
to: https://googleads.googleapis.com/v1/customers/{account 
number}/campaigns:mutate 
{
 "operations": [
    {
     "update": {
        "resourceName": "customers/{account number}/campaigns/{campaign ID}"
,
        "status": "PAUSED"
      }
    }
  ]
}



I receive the following response:
{
  "error": {
    "code": 400,
    "message": "Request contains an invalid argument.",
    "status": "INVALID_ARGUMENT",
    "details": [
      {
        "@type": 
"type.googleapis.com/google.ads.googleads.v1.errors.GoogleAdsFailure",
        "errors": [
          {
            "errorCode": {
              "fieldMaskError": "FIELD_MASK_MISSING"
            },
            "message": "Cannot use empty field mask in update operation.",
            "location": {
              "fieldPathElements": [
                {
                  "fieldName": "operations",
                  "index": "0"
                }
              ]
            }
          }
        ]
      }
    ]
  }
}

I am unsure how to set the field mask in the Google ads API so that I am 
indicating I am only updating the campaign status field. I can't find much 
JSON documentation for the ads API and have tried several different ways 
without much luck, so any help is appreciated.

Thanks.

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