AngularJS - Posting data to API is not working

I am trying to send data that a user puts into a textarea and text input to and API that will save the data.

Here is the function:

$scope.forward = function() {



  $http({

    url: 'http://appsdev.pccportal.com:8080/ecar/api/reject/' + carID,

    method: "POST",

    data: "comments=" + this.comments,

    data: "recipient=" + this.recipient,

    headers: {'Content-Type': 'application/x-www-form-urlencoded'}

  }).

  then(function(response) {

    $scope.output = response.data;

  })



}

What it does when it is run is it logs only the recipient and not the comments. I am guessing because I am using "data" twice and it is only recognizing the last one (in this case "recipient"). How can I pass 2 values through this to the API.

Thanks