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][1] and it is showing and working fine. But I don't know to to validate and showing messages here.

[![enter image description here][2]][2]

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


  [1]: http://magento.stackexchange.com/questions/150043/custom-payment-method-not-showing-in-checkout-page-in-magento-2/150088#150088
  [2]: https://i.sstatic.net/AYva0.png