how to add return url to paypal's javascript/rest express checkout simple intergration

Question

I have paypals simple express checkout javascript and I have a problem while testing it, I can not seem to fiqure out how to add a return url to the code below.

under the paypal developer sites apps & credentials, I have created a REST API app and added a return url there, but this does not seem to work with the simple javascript Express Checkout integration as listed below.

Can I simply pass in return and cancel urls or does the Basic client intergration not allow this??

sorry to ask a stupid question , it just palpays docs are not that good at all and looking threw google there lots of different options to do the same basic things

<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

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

    client: {
        sandbox: 'sandbox',
        production: 'production'
    },
    // Wait for the PayPal button to be clicked

    payment: function () {

        // Make a client-side call to the REST api to create the payment

        return paypal.rest.payment.create(this.props.env, this.props.client, {
            transactions: [
                {
                    amount: {total: '10.99', currency: 'USD'}
                }
            ]
        });
    },
    // Wait for the payment to be authorized by the customer

    commit: true, // Optional: show a 'Pay Now' button in the checkout flow

    onAuthorize: function (data, actions) {

        // Execute the payment

        return actions.payment.execute().then(function () {
            // Show a success page to the buyer
        });
    }

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

Answer 1

I gave up on this widget as it is limited and hell lot buggy. But I think you would redirect by doing it within the onAuthorize callback handler.

paypal.Button.render({
    // etc...
    onAuthorize: function (data, actions) {
        return actions.payment.execute().then(function () {
            // redirect to success page
        }).catch(function(err) {
            // redirect to error page
        });
    }
}, '#paypal-button-container');