Your Balance can be negative for a few reasons:

• You received a fine. In this case, the fine receipt is sent to your registered email address
• Your payment for the previous order failed. You can check this in the Payments section by clicking See transactions.

There are two ways to settle the failed payment:

• Top up your balance in the app under the Payments section
• Take another trip. You will be charged for the failed payment together with the price of the new ride