Use this sample code

var async = require('async')

var fs = require('fs')

var https = require('https');



async function read_message_store_fax(){

  try {

    var resp = await platform.get('/restapi/v1.0/account/~/extension/~/message-store', {

          dateFrom: '2021-01-01T00:00:00.000Z',

          direction: ['Inbound'],

          messageType: ['Fax']

        })

    var jsonObj = await resp.json()

    for (var record of jsonObj.records){

      console.log(record)

      if (record.hasOwnProperty('attachments')){

        async.each(record.attachments,

          function(attachment, callback){

              var fileName = attachment.id + "_fax_attachment"

              var fileNameExt = attachment.contentType.split("/")

              fileName += "." + fileNameExt[1]

              download_content(attachment.uri, fileName)

              callback()

            })

      }

    }

  }catch (e){

    console.log(e.message)

  }

}



async function download_content(contentUri, fileName){

    var uri = platform.createUrl(contentUri, {addToken: true});

    download(uri, fileName, function(){

      console.log("Save atttachment to the local machine.")

    })

}



const download = function(uri, dest, cb) {

    var file = fs.createWriteStream(dest);

    var request = https.get(uri, function(response) {

  response.pipe(file);

  file.on('finish', function() {

      file.close(cb);

  });

    });

}

Thank you. I can retrieve all the records and "pdf" files are created. However, each one contains the following:

{

"errorCode" : "AGW-401",

"message" : "Authorization header is not specified",

"errors" : [ {

"errorCode" : "AGW-401",

"message" : "Authorization header is not specified"

} ]

}

I am new to RingCentral programming, but it appears that the token is added to contentUri. Perhaps this isn't working because of my authentication scheme and the way I created my application. I created the application as Other Non-UI (e.g. cronjob, daemon, command line) .

I do this in my code:

var rcsdk = new RC({

server: RINGCENTRAL_SERVER,

clientId: RINGCENTRAL_CLIENTID,

clientSecret: RINGCENTRAL_CLIENTSECRET

});

var platform = rcsdk.platform();

This works to retrieve the records, but not to retrieve the contents.

Any suggestions?

Try this then. Remember to take care of API rate limit!

https://medium.com/ringcentral-developers/ringcentral-api-rate-limit-explained-2280fe53cb16

var async = require('async')

var fs = require('fs')



async function read_message_store_fax(){

  try {

    var resp = await platform.get('/restapi/v1.0/account/~/extension/~/message-store', {

          dateFrom: '2021-01-01T00:00:00.000Z',

          direction: ['Inbound'],

          messageType: ['Fax']

        })

    var jsonObj = await resp.json()

    for (var record of jsonObj.records){

      console.log(record)

      if (record.hasOwnProperty('attachments')){

        async.each(record.attachments,

          async function(attachment){

              var fileName = attachment.id + "_fax_attachment"

              var fileNameExt = attachment.contentType.split("/")

              fileName += "." + fileNameExt[1]

              var res = await platform.get(attachment.uri)

              var buffer = await res.buffer();

              fs.writeFileSync(fileName, buffer)

            })

      }

    }

  }catch (e){

    console.log(e.message)

  }

}

Thank you! That did the trick.