Hi Siva,
Thank you for writing to us regarding your concern. Since you are trying to access AdWords API from Salesforce, I would recommend reaching out to the Salesforce team via this forum as they are better equipped to assist you with your concern. We do not have any related blogs or posts that could assist you with your concerns as this is outside our expertise. Please feel free to reach out for any AdWords API related concerns.
Regards,
Nikisha Patel, Google Ads API Team