How to integrated Zoho CRM Api V2 into an php app

How to integrated Zoho CRM Api V2 into an php app

Hello,

Im using this documentation:  https://www.zoho.com/crm/developer/docs/server-side-sdks/php.html

But i have many questions.

1 ) At Self Client, where is the list of Scopes i can use?
2 ) i wanna created news oportunities from my app wen an user register, as i see, Api Module Name are Leads but wen i see this code example:  https://www.zoho.com/crm/developer/docs/php-sdk/record-samples.html?src=create_record what is "Record_id" if i'm creating a new record? 

The documentation are some confused, also, at this:  https://www.zoho.com/crm/developer/docs/php-sdk/initialize.html where i can find  ZohoOAuth class?

I setup the token path at configuration array but im getting too the error  No Tokens exist for the given user-identifier,Please generate and try again.
I need to generated new token every 10 minutes to interact with the Zoho Api?

Thanks.