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Discover Aggregated Transactions {#um-intro-discover-aggr}
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When the cardholder taps their card for travel, initiate an aggregated transaction by requesting an authorization for 1.00 USD that includes the processingInformation.authorizationOptions.aggregatedAuthIndicator field set to `true`. If the issuer approves the authorization, subsequent taps do not require an authorization. The capture amount must not exceed 15.00 USD in the US, and the capture date must not exceed the aggregation duration of up to 14 days from the first tap transaction.  
If the aggregate total nears the maximum aggregation amount, and the next tap will cause the aggregation amount to exceed 15.00 USD, capture the existing aggregate total. Then, authorize the current tap for 1.00 USD to begin a new aggregation cycle, and include the processingInformation.authorizationOptions.aggregatedAuthIndicator field set to `true`.  
For more details about Discover aggregated transactions, see the *Discover Global Network Contactless D-PAS: Open Loop Transit Implementation Guide*.  
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