Get a transaction(s) via tag

Retrieve a list of transactions related to the given customerId and tag. The list is ordered by settledDate, descending.

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The output is a list because multiple transaction objects may be tied to a given transactionId. This is because a single call to transfer/create can result in multiple transactions, e.g., a fee is applied (such as an NSF during NACHA file processing). A fee is considered a separate, but instrinsically related, transaction.