Integrating redirection payment method

Hello Sir/Madam,
I want to integrate Rapyd payment for my eCommerce website.
Customer will be redirected to Rapyd site to complete payment and after completing payment customer will be redirected to site.

I am following this with example and trying same example given in this link for my website but every time I am getting error for “UNAUTHENTICATED_API_CALL”.

So can you please suggest a full example for this and how to call this API ? Or what is wrong with my API call ?

Here is my API call with a postman with an error message. I checked there is no whitespace in my request.

Thanks @kamlesh, have you seen this article? I'm using Postman, and Getting an Error with the API

It looks like UNAUTHENTICATED_API_CALL using Postman, may occur from errors with your API keys or the wrong endpoint.

Here are some resources that can help you: