To see what credit card transactions have been attempted through the system on a particular day, go to the Credit Card History screen and input the date you wish to view. Transactions appear with the result listed. This list will include both transactions which were successful as those that failed for some reason.
Each payment attempt row can be clicked to view detailed transaction information.
If the transaction result details indicate "Approved" then it succeeded and it WILL settle with the bank overnight. If it shows ANYTHING else, then it didn't, and it WILL NOT settle with the bank overnight.
One important thing to be aware of is that transactions sometimes get an authorization number even if they fail. This happens for various reasons. Because of this, some patrons may see the failed transaction on their CC account for up to 72 hours (usually drops off within 24 hours). But if the transaction wasn't successful, it will go away automatically. This is a process of the patron's credit card company which may hold the funds on their card temporarily. For additional details on this see FAQ - Credit Card Declined.
Duplicate Transaction Submitted means that the same transaction was submitted on the same card within about a two minute window. The system automatically blocks these to help prevent patrons from accidentally charging their own card twice for the same order.