Fax attachments download using jquery (Using JavaScipt SDK)

I am using Java Script SDK to download fax attachment. I am calling this API to get all faxes with attachment.

API calling Code :-

platform.get('/account/~/extension/~/message-store?messageType=Fax&dateFrom=2017-03-16T01:00:00.000Z&direction=Inbound').then(function(response) {

var abcd = "";

$records = response.json().records;

platform.get('https:/platform.ringcentral.com/restapi/v1.0/account/~/extension/[EXT-ID]/message-store/[ATTACHMENT-ID...{

abcd = response1;

});

I am getting response like this.

1. ApiResponse {_externals: Externals, _request: Request, _response: Response, _text: "", _json: null, ...}
2. 
   
   1. _externals: Externals {PubNub: , localStorage: Storage, Promise: , fetch: , Request: , ...}
   2. _json: null
   3. _multipart: []
   4. _request: Request {originalBody: undefined, method: "GET", url: "https://platform.ringcentral.com/restapi/v1.0/acco...8/message-store/907893279008/content/907893279008...;, headers: Headers, destination: "", ...}
   5. _response: Response {type: "cors", url: "https://platform.ringcentral.com/restapi/v1.0/acco...8/message-store/907893279008/content/907893279008...;, redirected: false, status: 200, ok: true, ...}
   6. _text: ""
   7. __proto__: Object

How to download or display fax attachment from this response ? Please assist me ASAP.