In order to enroll in Uber for Business, your business must have a unique, corporate email domain that is used for employee email addresses (e.g. email@example.com).
Your business must also have a credit card account that can be used to process all transactions. In lieu of a credit card account, some cities and countries offer the option of prepayment. In many countries, your qualifying business can also enroll in a pay-per-month system with the option to pay by credit card or bank transfer.