How to pass Authorization Token in Header Angular JS

In my controller I am trying to call my API but I am unable to pass Autherization token.

I have created a config var and passing my token in it but getting following response:

900902Missing CredentialsRequired OAuth credentials not provided. Make sure your API invocation call has a header: "Authorization: Bearer ACCESS_TOKEN"

** JS Code **

 app.controller("AuthenticationController", function($scope, API_URL, vcRecaptchaService, $http) {

       var config = {
         headers: {
           'Authorization': 'Bearer 00000-e5673-346756f-8676-f7567561a'
         }
       };
       $scope.verifyRecaptcha = function() {

         if (vcRecaptchaService.getResponse() === "") {
           alert("User did not resolve the recaptcha")
         } else {
           var post_data = {
             'g-recaptcha-response': vcRecaptchaService.getResponse()
           }
           $http.post('https:1.1.1.1/abc/vdc/verify', config, post_data).success(function(response) {

               if (response.success === true) {
                 alert("Successfully resolved the recaptcha.");
               } else {
                 alert("User verification failed");
               }
             })
             .error(function(error) {
               alert("Error Occured while resolving recaptcha.");
               console.log(error);
             })
         }
       }