You can create your Reverb Sandbox account here: https://sandbox.reverb.com/signup
The Sandbox is just like Reverb Production but will allow you to experiment with creation and deletion of listings without impacting your production listings. Please ensure your shop settings and profile are setup before getting started.
Our Swagger documentation can be found here: https://reverb.com/swagger#!/
You can default to Reverb Payments for your payment settings found in Shop Settings -> Policies.
For the bank account info, you can use any Account Name, 322271627 for the Routing Number, and any set of numbers for the Account Number.
For purchases, you can create a separate Purchasing sandbox test account, and set up the credit card to purchase your own listings. These listings can be found through searching for the title.
You can edit your credit cards in Settings -> My Account -> Credit Cards. You can use 4111 1111 1111 1111 for the credit card number, 10/2020 for expiration, and 737 for the CVC to buy any of your items for testing purposes. You can also access this in Shop Settings -> My Bill.
Once an item is purchased you can mark the order paid/shipped as necessary through your seller dashboard.