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I have made some changes to existing print_backend_cups, I modified on_handle_print_socket() function and added some features to connect CPDB backend with OAuth. I also added end_print_job_with_token() function which will be responsible for processing print request after successfully verifying the access token and after that the process authentication process will be completed.
I have also added function to store access token and the access token will be expired within a minute and it can not be used after that and they are not reusable as well. Only requested client can access the access token and we are not compromising security in the complete OAuth flow.