gistfile1.js

$.ajax({
  url: url,
  type: "POST",
  dataType: "json",
  contentType: 'application/json',
  data: JSON.stringify(waterfallCredentials),
  success: (function(_this) {
    return function(response) {
      var mobileNum, payload, url;
      console.log('successful authentication to waterfall', response);
      mobileNum = _this.$mobile.val().match(/\d/g).join("");
      url = 'http://three.waterfallmobile.com/api/v1/messaging/sendContent';
      payload = {
        "modules": [
          {
            "type": "SUBSCRIPTION",
            "params": {
              "listId": "52eff91c0cf22e9cd391bd16",
              "optInType": "doubleOptIn",
              "optInMessage": "Reply Y to Join!",
              "confirmMessage": "Thanks. Message & Data Rates May Apply. Text STOP to end"
            }
          }
        ],
        "msisdns": [mobileNum]
      };
      return $.ajax({
        url: url,
        type: "POST",
        dataType: "json",
        data: JSON.stringify(payload),
        success: function(response) {
          return log("succesful mobile payload.");
        }
      });
    };
  })(this)
});