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HTML 

              
                <header class="w3-container w3-teal">
		<h1>GreenPay Widget Example</h1>
	</header>

	<div class="w3-container w3-blue">
		<h2> 1- Widget no modal</h2>
		<article class="w3-container" id= "widgetNoModal"> 
		</article>
		<h2> 2- Widget modal</h2>
		</div>
			<div class="modal fade" id="myModal" role="dialog">
			<div class="modal-dialog">

				<!-- Modal content-->
				<div class="modal-content">
					<div class="modal-header">
						<button type="button" class="close" data-dismiss="modal">&times;</button>
						<h4 class="modal-title">GreenPay Payment</h4>
					</div>
					<div class="modal-body" id="AreaPagoGreenPay">
						<!-- <div gpsession="" gptoken="" environment="production or sandbox"></div> -->
					</div>
					<div class="modal-footer">
						<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
					</div>
			</div>

		</div>
	</div>
	<button type="button" class="btn btn-success btn-md" id="myBtn">Show Widget Modal (show:true)</button>
	</body>
!

CSS 

              
                .cardform{
	background: #efefef;
	width: auto;
}

.btnPay{
	background: gray;
	color: white;
}

.cardform input{
	background-color: white;
	border: 1px solid #ccc;
}
!

JS 

              
                $(document).ready(function () {
			var order = {
    secret: "NTJFRDE2RThFMUZCQTQ1MTJGNzIwMjUxNTdDMUMwNkI3MDJBQ0Y0QkIzQkNBNEVENUY0RTU2NjI0OTExOTFBQ0QxMjc5QzZDMzcxOTdDOEE5OUVGNENFNTU4QTFFNkUzOERDOTAwMEI3NjZDMEU1RjY5RTU2MjBBNjEzNEE5QzA=",
    merchantId: "f22c73c3-dd85-4827-be65-66225aa1907f",
    terminal: "PluginsDev-BNCR-Colones",
    amount: Math.floor(Math.random() * (+100000 - +1000)) + +100,
    currency: "CRC",
    description: "Modal checkout example",
    orderReference: "MCE-" + Math.floor(Math.random() * (+100000 - +1000)) + +100,
    additional: {
        customer: {
            name: "User Example",
            email: "TEST@DECLINE.COM",
            billingAddress: {
                country: "CR",
                province: "San José",
                city: "Curridabat",
                street1: "Freses"
            },
            shippingAddress: {
                country: "CR",
                province: "San José",
                city: "Curridabat",
                street1: "Frese"
            }
        },
        products: [{
            description: "Descripción de producto",
            skuId: "Identificador único en el comercio",
            quantity: 1,
            price: 100.00,
            type: "Tipo de producto"
        }]
    }
}
			//Show widget no modal
			postData("#widgetNoModal", order)

			// Show modal
			$("#myBtn").on("click", function () {
				postData("#AreaPagoGreenPay", order)
			});
		});

		//Add the div element with the checkout order data
function insertHtml(elementId, data) {
	console.log(data);
	$(elementId).html(
		`<div id="gpSecuurity" gpsession=${data.session} gptoken=${data.token} environment="sandbox"></div >`
	);
}

		//Creates the checkout order (This must be executed from backend to prevent expose your GreenPay API credentials)
		const postData = (elementId, order) => {
			return axios.post("https://sandbox-merchant.greenpay.me", order, {
				headers: {
					'Accept': 'application/json',
					'Content-Type': 'application/json'
				}
			}).then((data) => {
				//console.log("data",data.data);

				insertHtml(elementId, data.data);

				if (elementId === "#AreaPagoGreenPay") {
					$("#myModal").modal({
						show: true
					});
				}

				loadWidget();
			}).catch(error => console.error(error));
		}

		//Loads the widget code
		function loadWidget() {
			//TODO
			/**
			 * Make a call to your backed to create a payment order
			 * Wait to get the response obtained in your backenk.
			 * Update gpsession and gptoken element values with the response got it in your backend
			*/
			var script = document.createElement("script");
			script.src = "https://widget.greenpay.me/1.4.1/gpwidget.min.js";
			script.type = "text/javascript";
			document.body.parentNode.appendChild(script);

		}

		//Shows in the console the checkout response received
		function greenPayResponse(id, res) {
			//Add your logic
			if (res.status == "200") {
				//Response is OK, someting payed
				console.log("payed", JSON.stringify(res, null, 2))
			} else {
				//An ERROR ocurred
				console.log("error", JSON.stringify(res))
			}
		}
!
999px

Console