How can i post the ngCart checkout button on http using php and angular js?

I do not know how can i post my data's into a new php page and this is my code:

<ngcart-checkout service="http" settings="{ url:'./checkout.php' }">Checkout </ngcart-checkout>

but the original code from the ngCart docs is

<ngcart-checkout service="http" settings="{ url:'/checkout' }"></ngcart-checkout>

the ngcart-checkout code is

<button class="btn btn-primary" ng-click="checkout()" ng-disabled="!ngCart.getTotalItems()" ng-transclude>Checkout</button>

still it does not redirect me unto checkout.php and so i go to the ngcart.js and the codes for the checkout using http post is

   .service('ngCart.fulfilment.http', ['$http', 'ngCart', function($http,        ngCart){

     this.checkout = function(settings){
         return $http.post(settings.url,
             {data:ngCart.toObject()})
     }
  }])

so again my problem was how can i redirect my checkout button unto the checkout.php and how can i post those items unto the checkout.php using http post?