Which part is data point value

Our customer would like to calculate the data point value in 1 message.
To check Octave user guide (Using the REST API in an External System), we saw the following sample code in “Sending Events to Octave”.
Please let us know which parts is the data point in 1 message?

{
“head”:{
“status”:201,
“ok”:true,
“messages”:[
“Your request has been processed successfully. A new resource has been created.”
],
“errors”:[

  ],
  "references":{

  }

},
“body”:{
“id”:“e5b7311856f38613585853e61”,
“streamId”:“s5b7310ae6f38613585853e5b”,
“creationDate”:1534267781805,
“generatedDate”:1534267781805,
“path”:"/my_company/streamname",
“version”:0,
“elems”:{
“measure”:7
}
}

Hello Takashi,

“measure”:7 is 1 datapoint in this message. The customer is only charged for this datapoint, in this message. There are no charges for the meta data.