How to test transfer failures

How can i test this scenarios mentioned in this doc. I tried with naming my source bank as R01 and send a transfer but the transfer is completed successfully. Please suggest a way to test.

Hi @Ajay_Dev_M – you seem to be on the right track with naming the source bank as R01 to have the transfer failed. Here’s our docs where we go into detail – Testing ACH, RTP, P2D, and VANs Transfers in the Dwolla Sandbox | Dwolla API Documentation

Do you have an example that you could share? A transfer Id? I could take a look on our end to see what’s up.