var options = {
                method: 'post',
                json: true,
                url: 'https://graph.facebook.com/'+commentId+'/comments?message='+req.body.message+'&access_token={{ACCESSTOKEN}}'
            }
            request(options, function(error, response, body) {
                if(error){
                }
                console.log('posted reply successfully');
            });

Hi I using graph API to reply to comment on facebook pages of my customers (it is a SaaS product). Right now I am generating facebook page level access token for mine own and it's working fine for few minutes. But I want to generate page level access token programmatically, so that it does not expire and it is dynamic for different customer's facebook pages. Is there any way I can generate page level access token programmtically for my own facebook page?