There are no automatic redirection with paypal/rest-api-sdk-php

Implementing paypal in my laravel 5.8 app

Looking at the code snippet : https://developer.paypal.com/docs/archive/checkout/integrate/?mark=get%20the%20code#set-up-your-development-environment

I do not seer which is returns valid format?

here https://developer.paypal.com/docs/integration/direct/payments/paypal-payments/#create-paypal-payment I found that redirect_urls must be used , so my button definition is :

                    <script>
                        paypal.Button.render({
                            // Configure environment
                            env: 'sandbox',
                            client: {
                                sandbox: 'CLIENTID',
                                production: 'demo_production_client_id'
                            },
                            // Customize button (optional)
                            locale: 'en_US',
                            style: {
                                size: 'small',
                                color: 'blue',
                                shape: 'pill',
                            },

                            commit: true,

                            payment: function(data, actions) {
                                return actions.payment.create({

                                    "note_to_payer": "Contact us for any questions on your order.",

                                    "intent": "sale",
                                    "payer": {
                                        "payment_method": "paypal"
                                    },

                                    redirect_urls : { //redirect_urls
                                        return_url : 'https://www.votes.nilov-sergey-demo-apps.tk/paypal_payment',
                                        cancel_url : 'https://www.votes.nilov-sergey-demo-apps.tk/paypal_payment_cancel'
                                    },

                                    transactions: [{
                                        amount: {
                                            total: '0.01',
                                            currency: 'USD'
                                        }
                                    }]
                                });
                            },
                            // Execute the payment
                            onAuthorize: function(data, actions) {
                                console.log("onAuthorize data::")
                                console.log( data )

                                console.log("onAuthorize actions::")
                                console.log( actions )

                                return actions.payment.execute().then(function() {
                                    // Show a confirmation message to the buyer

                                    window.alert('Thank you for your purchase! 0');
                                });
                            }
                        }, '#paypal-button');

                    </script>

I see alert in actions.payment.execute method, but no automatic rederection at url specified in return_url, as I expected.
I uploaded my site live at https://www.votes.nilov-sergey-demo-apps.tk under LAMP, Ubuntu 18 , Digital Ocean. Why there are no automatic redirection ?

$ php artisan --version
Laravel Framework 5.8.24

In composer.json:
"paypal/rest-api-sdk-php": "*",

via Chebli Mohamed