I want to use Zoho Sprints API is REST .

I did Initial setup.

https://sprints.zoho.com/apidoc.html#Initialsetup

I successed to get code  by 'Generate grant token' .

When I get access and refresh token, it was error.

Error message is {"error":"invalid_client"}.

I executed within one minute of the code expiration date, but I get an error.

https://sprints.zoho.com/apidoc.html#Getaccessandrefreshtoken

Please support me.

Thank you.