get https://core.spreedly.com/v1/transactions/
Get the transaction with the given token.
Any interaction that creates or updates information via the Spreedly API,
or sends information to a third party such as a gateway or receiver, will
generate a corresponding transaction record that may be viewed by
submitting its transaction_token. This may be viewable in the body of the
original response or by retrieving it from the Transactions List in the
Spreedly app.