If it has to do with the API or information at developers.dwolla.com it belongs here!
Missing details of webhooks documentation. Which fields could be missing or null? What are the all the possible values for some string values?
for TransactionStatus: Type, Subtype, Transaction.Type, Transaction.Status, Transaction.Fees,
for TransactionReturned: Type, Subtype, ReturnCode, ReturnDescription
for RequestFulfilled: Status, Transaction.Status, DateCancelled, AdditionalFees
for RequestCancelled: Status, AdditionalFees