After you successfully create a Sandbox account, Dwolla will systematically create a Dwolla Balance and a bank funding source for you.
The bank name is called the “Superhero Savings Bank” and the Dwolla Balance will have $5,000 in test funds. You can initiate transfers to or from these funding sources.
To add another bank in the Sandbox, you will need to make a request to the API.
Authorization: Bearer pBA9fVDBEyYZCEsLf/wKehyh1RTpzjUj5KzIRfDi0wKTii7DqY
"name": "My Dwolla Master Account Bank"
HTTP/1.1 201 Created
We do not have functionality to add a bank to a Dwolla Master Account in the Sandbox dashboard at this time.