embodiments relate to token assurance level based transaction processing . an aspect includes receiving , from a requester by a tokenization server in an electronic payment system , a request for de - tokenization of a token corresponding to a transaction . another aspect includes determining a token assurance level of the token . another aspect includes based on the token assurance level of the token ; assigning a quality of service to the transaction . yet another aspect includes performing the de - tokenization based on the assigned quality of service and returning an account number corresponding to the token to the requester .