I have some validations to place order through custom TestPayment method, for this I have to disable/enable the PlaceOrder button and showing some message under my custom payment method section. For this I have created the custom payment method and it is showing and working fine. But I don't know to to validate and showing messages here.

So Could you please suggest me how to showing messages and enable/disable PlaceOrder Button here based on customer Data.

TestVendor/TestPayment/view/frontend/web/js/view/payment/method-renderer/testpayment-method.js

/*browser:true*/
/*global define*/
define(
    [
        'Magento_Checkout/js/view/payment/default',
        'Magento_Customer/js/customer-data'
    ],
    function (Component, customerData) {
        'use strict';

        var customer_Data;

        return Component.extend({

            initialize: function () {
                this._super();

                customer_Data = customerData.get('customer');
            },

            defaults: {
                template: 'TestVendor_TestPayment/payment/testpayment'
            },

            /** Returns send check to info */
            getMailingAddress: function() {
                return window.checkoutConfig.payment.checkmo.mailingAddress;
            },
            isDisplayed:function () {
                // you can modify your custom logic
                console.log(customer_Data);console.log('customer_Dat');
                return false;
            }

        });
    }
);