Google Cloud Translation API error in server

[vimukthis]

My application uses Google Cloud Translation API for language translation. The API works fine when I run my application in local PC and in my personal domain, but when I deploy it into the client server(with a different domain) the translation API throws me the below error,

Mar 21 04:42:07 chatbot-app2 gunicorn[61109]:   
Your client does not have permission to get URL <code>/language/translate/v2</code> from this server.  <ins>That’s all we know.</ins>

This only happens in different domains. First I deployed it in my personal domain and it worked fine in it. But when I move it to my clients domain it throws me this error. and I have updated my curl versions as I have seen in a previous solution but nothing works.