This is easily possible simply via Finance/Budget bill as Petroleum Products are outside GST purview (thus, not requiring any Constitutional Changes).

1. This deduction is to be applied only on receiving/credit account.
2. This deducted amount will be credited to Central Government and Transacting Bank/Digital Agency in justified proportions..
   (e.g., Of the say 0.3 % deduction, 0.288 % will go to the Central Government and rest 0.012 % to the Bank/Digital Agency at receiving/credit end).