langkah2
ke sini dulu https://console.developers.google.com/iam-admin/serviceaccounts
trus buat project baru abis itu 'create service account'
pas bagian Service account details di sisi bebas
pas Grant this service account access to project pilih rolenya Currently used -> owner
done ,
trus ke klik email yg belakangnya iam.gserviceaccount.com trus ke keys -> add key pilih yg .json
abis itu ke download
hasil json terdapat client_email -> copy paste pada link folder google drive
nah hasil download isinya masukin ke client_secret.json timpa aja
baru dah jalanin