THIS CODE CAN NOT RUN IN BROWSER
1. Enqueue Scripts `paypal-mobile-js-helper.js`
<script src="data/js/paypal-mobile-js-helper.js"></script>

2. Paste this code Custom JS and change settings

// required: cordova plugin add com.paypal.cordova.mobilesdk
// https://developer.paypal.com/developer/applications/

.directive("buyWithPaypal", function(PaypalService){
	return {
			controller: function($scope, $element, $attrs){
			$element.bind("click", runApp);
			function runApp(event)
			{
                PaypalService.initPaymentUI().then(function () {
                  	var price = $attrs.price || 30;
                  	var product = $attrs.product || "IMA Builder";
                    PaypalService.makePayment(price, product);
                });
			};
		}
	};
})

 
.factory('PaypalService', ['$q', '$ionicPlatform', '$filter', '$timeout', function($q, $ionicPlatform, $filter, $timeout)
{
	var shopSettings = {  
	   payPalSandboxId : 'AbcI0KDO9jz0wz5Dg7-So5pyH2CtMkbHBJLW1LAvvGG0GuBAEubYJH7Ip2UJeZiqUpZaHz30WiF0BzUr',
	   payPalProductionId : 'AbcI0KDO9jz0wz5Dg7-So5pyH2CtMkbHBJLW1LAvvGG0GuBAEubYJH7Ip2UJeZiqUpZaHz30WiF0BzUr',
	   payPalEnv: 'PayPalEnvironmentProduction',   // for testing  production for production
	   payPalShopName : 'MyShopName',
	   payPalMerchantPrivacyPolicyURL : 'url to policy',
	   payPalMerchantUserAgreementURL : ' url to user agreement ' 
	}
	
	var init_defer;
	var service =
	{
		initPaymentUI: initPaymentUI,
		createPayment: createPayment,
		configuration: configuration,
		onPayPalMobileInit: onPayPalMobileInit,
		makePayment: makePayment
	};

	function initPaymentUI()
	{
		init_defer = $q.defer();
		$ionicPlatform.ready().then(function()
		{
			var clientIDs =
			{
				"PayPalEnvironmentProduction": shopSettings.payPalProductionId,
				"PayPalEnvironmentSandbox": shopSettings.payPalSandboxId
			};
			PayPalMobile.init(clientIDs, onPayPalMobileInit);
		});
		return init_defer.promise;
	}
	function createPayment(total, name)
	{
		var payment = new PayPalPayment("" + total, "USD", "" + name, "Sale");
		return payment;
	}
	function configuration()
	{
		var config = new PayPalConfiguration(
		{
			merchantName: shopSettings.payPalShopName,
			merchantPrivacyPolicyURL: shopSettings.payPalMerchantPrivacyPolicyURL,
			merchantUserAgreementURL: shopSettings.payPalMerchantUserAgreementURL
		});
		return config;
	}
	function onPayPalMobileInit()
	{
		$ionicPlatform.ready().then(function()
		{
			PayPalMobile.prepareToRender(shopSettings.payPalEnv, configuration(), function()
			{
				$timeout(function()
				{
					init_defer.resolve();
				});
			});
		});
	}
	function makePayment(total, name)
	{
		var defer = $q.defer();
		total = $filter('number')(total, 2);
		$ionicPlatform.ready().then(function()
		{
			PayPalMobile.renderSinglePaymentUI(createPayment(total, name), function(result)
			{
				$timeout(function()
				{
					defer.resolve(result);
				});
			}, function(error)
			{
				$timeout(function()
				{
					defer.reject(error);
				});
			});
		});
		return defer.promise;
	}
	return service;}
])

3. Insert HTML like this
    
	<button class="item item-button button button-calm" buy-with-paypal price="30.00" product="IMA Builder Pro">$30 Order Now</button>
    <button class="item item-button button button-calm" buy-with-paypal price="15.00" product="IMA Builder Home">$15 Order Now</button>
    <button class="item item-button button button-calm" buy-with-paypal price="1000000.00" product="IMA Builder Ultimate">$1000000 Order Now</button>