Most probably this error happened because you are trying to send HTTP requests to ClickPay side using front-end JavaScript. 

In this article you will be going to know about:

How to investigate the reason that caused this error?

You can check this error from your browser console as shown below

Reason #1: A Frontend HTTP request sent to ClickPay

That means that you are using frontend JS to send/receive HTTP requests/responses within your integration with ClickPay. Which is not supported by ClickPay for higher security purposes.

In this case, you will have to use your backend to perform those sending/receiving HTTP requests/responses actions.

To know more about our various integration methods which include backend packages and eCommerce plugins and more please check our: How To Integrate With ClickPay solution article.