JSFiddle - React, Tailwind, and code Playground

HTML

<body ng-app="angularjs-starter">
     <script src="https://js.stripe.com/v3/"></script>
    <form name="regForm" id="register-form" ng-controller="MainCtrl">
    <input ng-model="reg.email" type="email" name="username">
    <div id="stripe-wrapper">
        <div id="card-element"></div>
    </div>
    <small id="card-errors" class="text-danger" role="alert">{{ ccErrMsg }}</small>
    <br>
    <button ng-model="reg.btn" ng-disabled="stripeCompleted ===false || !regForm.username.$valid">Register</button>
    </form>
  </body>

JavaScript

var app = angular.module('angularjs-starter', []);

app.controller('MainCtrl', function($scope,$rootScope) {
  $scope.stripeCompleted = false;
  // stripe initialization code
    var displayError=   document.getElementById('card-errors');
    console.log(displayError);
    var stripe=         Stripe("pk_test_6pRNASCoBOKtIshFeQd4XMUh");
    var elements=       stripe.elements();
    var card=   elements.create("card");
    card.mount("#card-element");
    card.addEventListener('change', function(event) {
        if (event.error) {
             displayError.textContent = event.error.message;
        } else {
             displayError.textContent = '';
        }
        if(event.complete) {
   				$scope.stripeCompleted = true;
  			} else {
          $scope.stripeCompleted = false;         
        }
         $scope.$apply();
     });

				var formID= "register-form";
        var form=   document.getElementById(formID);
        var stripeTokenHandler = function(token, formID) {
            // Insert the token ID into the form so it gets submitted to the server
            var form = document.getElementById(formID);
            var hiddenInput = document.createElement('input');
            hiddenInput.setAttribute('type', 'hidden');
            hiddenInput.setAttribute('name', 'stripeToken');
            hiddenInput.setAttribute('value', token.id);
            form.appendChild(hiddenInput);
            // Submit the form
            form.submit();
        }
        form.addEventListener("submit",function(event){
            event.preventDefault();
            stripe.createToken(card).then(function(result){
                if(result.error) {
                    displayError.textContent=   result.error.message;
                } else {
                    stripeTokenHandler(result.token, formID);
                }                               
            })
        });			
});