Retrieve a list of transactions related to the given customerId and transactionId. The list is ordered by settledDate, descending. [block:callout] { "type": "info", "body": "The output is a list because multiple <a href="https://docs.helix.q2.com/docs/transaction\" target="_blank">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." } [/block]