Magento – Get company name when adding new address

$this->getBlockHtml('formkey') creates a hidden field which you should not remove. (It is a security feature to help protect against cross-site scripting attacks.)

<?php echo $this->getNameBlockHtml() ?> would logically take you to app\code\core\Mage\Customer\Block\Address\Edit.php which is probably the PHP file you mentioned. The important thing to note there is the getNameBlockHtml() method, which dynamically creates a new 'customer/widget_name' block. As the name of the block suggests, the template for that block can be found in app\design\frontend\base\default\template\customer\widget\name.phtml

Solved the above issue. If you want to avoid the update and cancel button under the billing address and implement the update functionality when click on place order button, no need to go through the above way.

File path: _vendor/magento/module-checkout/view/frontend/web/js/view/payment/default.js

First copy this file and place in your theme folder. Then, just replace this below code with the placeOrder function and hide the update and cancel button using css- display:none;

        placeOrder: function (data, event)
        {
            if($('.billing-address-form:visible').length == 0)
            {
                $('.action-update').click();
                var self = this;
                if (event) {
                    event.preventDefault();
                }
                if (this.validate() && additionalValidators.validate()) {
                    this.isPlaceOrderActionAllowed(false);

                    this.getPlaceOrderDeferredObject()
                        .fail(
                            function () {
                                self.isPlaceOrderActionAllowed(true);
                            }
                        ).done(
                            function () {
                                self.afterPlaceOrder();

                                if (self.redirectAfterPlaceOrder) {
                                    redirectOnSuccessAction.execute();
                                }
                            }
                        );

                    return true;
                }

                return false;
            }
            else
            {
                var firstname = $("input[name=firstname]").val();
                var lastname = $("input[name=lastname]").val();
                var street = $("input[name='street[0]']").val();
                var city = $("input[name=city]").val();
                var regionid = $("input[name=region_id]").val();
                var postcode = $("input[name=postcode]").val();
                var countryid = $("input[name=country_id]").val();
                var telephone = $("input[name=telephone]").val();

                if((firstname == '') || (lastname == '') || (street = '') || (city == '') || (regionid = '') || (postcode = '') || (countryid == '') || (telephone = ''))
                {
                    $('.action-update').click();
                }
            }

        },