You can do this by following these steps:
1. Open the tomato pay app.
2. Tap on Settings.
3. Tap Connections.
4. Tap the bin icon next to your bank account.
5. Follow the screen instructions.
Please note: if you have disconnected all your bank accounts you will be prompted to connect a new account.
If you have connected more than one bank account, you will be able to go to the Connections section of the app and reconnect the account you have just removed by clicking Connect Account. The process to do so can be found here.
If you only had one connected bank account you will have to reconnect it before you can continue using the tomato pay app.