woocommerce-paypal-payments/modules/ppcp-button/resources/js/modules/ActionHandler/CheckoutActionHandler.js

import onApprove from '../OnApproveHandler/onApproveForPayNow.js';
import {payerData} from "../Helper/PayerData";

class CheckoutActionHandler {

    constructor(config, errorHandler, spinner) {
        this.config = config;
        this.errorHandler = errorHandler;
        this.spinner = spinner;
    }

    configuration() {
        const spinner = this.spinner;
        const createOrder = (data, actions) => {
            const payer = payerData();
            const bnCode = typeof this.config.bn_codes[this.config.context] !== 'undefined' ?
                this.config.bn_codes[this.config.context] : '';

            const errorHandler = this.errorHandler;

            const formSelector = this.config.context === 'checkout' ? 'form.checkout' : 'form#order_review';
            const formValues = jQuery(formSelector).serialize();

            const createaccount = jQuery('#createaccount').is(":checked") ? true : false;

            return fetch(this.config.ajax.create_order.endpoint, {
                method: 'POST',
                body: JSON.stringify({
                    nonce: this.config.ajax.create_order.nonce,
                    payer,
                    bn_code:bnCode,
                    context:this.config.context,
                    order_id:this.config.order_id,
                    form:formValues,
                    createaccount: createaccount
                })
            }).then(function (res) {
                return res.json();
            }).then(function (data) {
                if (!data.success) {
                    spinner.unblock();
                    //handle both messages sent from Woocommerce (data.messages) and this plugin (data.data.message)
                    if (typeof(data.messages) !== 'undefined' )
                    {
                        const domParser = new DOMParser();
                        errorHandler.appendPreparedErrorMessageElement(
                            domParser.parseFromString(data.messages, 'text/html')
                                .querySelector('ul')
                        );
                    } else {
                        errorHandler.clear();
                        if (data.data.details.length > 0) {
                            errorHandler.message(data.data.details.map(d => `${d.issue} ${d.description}`).join('<br/>'), true);
                        } else {
                            errorHandler.message(data.data.message, true);
                        }
                    }

                    return;
                }
                const input = document.createElement('input');
                input.setAttribute('type', 'hidden');
                input.setAttribute('name', 'ppcp-resume-order');
                input.setAttribute('value', data.data.purchase_units[0].custom_id);
                document.querySelector(formSelector).append(input);
                return data.data.id;
            });
        }
        return {
            createOrder,
            onApprove:onApprove(this, this.errorHandler, this.spinner),
            onCancel: () => {
                spinner.unblock();
            },
            onError: () => {
                this.errorHandler.genericError();
                spinner.unblock();
            }
        }
    }
}

export default CheckoutActionHandler;