there are a lot of merchant transactions that don't require authorizations
In recent years, both VISA and MasterCard have changed their operating rules to require that preauthorizations be obtained for all transactions. (The exception to the rule is stand-in processing in the event of a network communications disruption.)
In the event a merchant fails to obtains a preauthorization, or receives a decline response and forces through a transaction resulting in a loss to the bank, you have chargeback rights.
MasterCard 4808 "Requested/Required Authorization not Obtained"
VISA Code 71 "Declined Authorization"
VISA Code 72 "No authorization"
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