Is there any working demo for PHP SDK version of ZOHO?

I have tried as many as different 15-20 blogs for authorization and trying to take PHP SDK into action.
But none are working at all. If we pass authorization, then it throws Refresh Token error. If we pass Refresh Token error we get some other exception.
It seems that exception is must to integrate PHP SDK :(

I have tried this :
https://help.zoho.com/portal/en/community/topic/kaizen-17-php-sdk
https://9code.info/zoho-v2-api-step-by-step-guide-with-using-php-sdk/
and many other links i don't remember as of now

Is there any one over this large community who has basic working code (authentication and basic crud)
?