Code

<script src="https://www.paypalobjects.com/api/checkout.js"></script>

<div id="paypal-button-container"></div>

<script>

// Render the PayPal button

paypal.Button.render({

// Set your environment

env: 'sandbox', // sandbox | production

// Specify the style of the button

style: {
label: 'credit',
size: 'medium', // small | medium | large | responsive
shape: 'rect', // pill | rect
},

// PayPal Client IDs - replace with your own
// Create a PayPal app: https://developer.paypal.com/developer/applications/create

client: {
sandbox: 'AZDxjDScFpQtjWTOUtWKbyN_bDt4OgqaF4eYXlewfBP4-8aqX3PiV8e1GWU6liB2CUXlkA59kJXE7M6R',
production: '<insert production client id>'
},

// Wait for the PayPal button to be clicked

payment: function(data, actions) {

// Set up a payment and make credit the landing page

return actions.payment.create({
payment: {
transactions: [
{
amount: { total: '0.01', currency: 'USD' }
}
]
}
});
},

// Wait for the payment to be authorized by the customer

onAuthorize: function(data, actions) {
return actions.payment.execute().then(function() {
window.alert('Payment Complete!');
});
}

}, '#paypal-button-container');

</script>