curl -L -X POST 'https://int-api.mx.com/users/:user_guid/connect_widget_url' \
-H 'Content-Type: application/json' \
-H 'Accept: application/vnd.mx.api.v1+json' \
-H 'Authorization: Basic BASE_64_ENCODING_OF{client_id:api_key}' \
--data-raw '{"config":{"client_redirect_url":"https://{yoursite.com}","color_scheme":"light","current_institution_code":"mxbank","current_member_guid":"MBR-7c6f361b-e582-15b6-60c0-358f12466b4b","disable_background_agg":false,"disable_institution_search":false,"enable_app2app":false,"include_identity":false,"include_transactions":true,"is_mobile_webview":false,"mode":"aggregation","oauth_referral_source":"BROWSER","ui_message_version":4,"ui_message_webview_url_scheme":"string","update_credentials":false}}'

const axios = require('axios');
let data = JSON.stringify({
  "config": {
    "client_redirect_url": "https://{yoursite.com}",
    "color_scheme": "light",
    "current_institution_code": "mxbank",
    "current_member_guid": "MBR-7c6f361b-e582-15b6-60c0-358f12466b4b",
    "disable_background_agg": false,
    "disable_institution_search": false,
    "enable_app2app": false,
    "include_identity": false,
    "include_transactions": true,
    "is_mobile_webview": false,
    "mode": "aggregation",
    "oauth_referral_source": "BROWSER",
    "ui_message_version": 4,
    "ui_message_webview_url_scheme": "string",
    "update_credentials": false
  }
});

let config = {
  method: 'post',
maxBodyLength: Infinity,
  url: 'https://int-api.mx.com/users/:user_guid/connect_widget_url',
  headers: { 
    'Content-Type': 'application/json', 
    'Accept': 'application/vnd.mx.api.v1+json', 
    'Authorization': 'Basic BASE_64_ENCODING_OF{client_id:api_key}'
  },
  data : data
};

axios(config)
.then((response) => {
  console.log(JSON.stringify(response.data));
})
.catch((error) => {
  console.log(error);
});

{
  "user": {
    "connect_widget_url": "https://int-widgets.moneydesktop.com/md/connect/jb1rA14m85tw2lyvpgfx4gc6d3Z8z8Ayb8",
    "guid": "USR-fa7537f3-48aa-a683-a02a-b18940482f54"
  }
}