I just had a transaction that completed. The transaction Id was reported through the webhook as a an integer XXXX132. When I look at the Dwolla site of the recipient, on the receiving side the id is XXXX131 and the .25c fee has the id XXXX130.
Can I assert that for any transaction the ids are numeric and the relationships are:
Fee id: N Receivers's id: N + 1 Sender's id: N + 2
If not, how do I determine all the ids since the web hook only reports one of them.
You are correct. We create transactions in the following order: Dwolla fee if necessary, facilitator fee if necessary, receiver, sender. Be careful assuming SenderId - 2 is the Dwolla fee because for transactions <= 10 it will be some random transaction, not the fee for your transaction.
This is subject to change at any time so I wouldn't make crucial decisions based on this information.
来源：https://stackoverflow.com/questions/14163351/dwolla-transaction-ids-relationship