To be able to rent and drive cars you first need to have verified your e-mail address and saved information such as your title, full name, registered address, and date of birth. You also need to enter and save a mobile number and your preferred method of payment.
You have to be at least 21 years old to use SIXT share. The information on your driving licence must be entered and saved in the app (driving licence requirements can be found here).
The validation process ensures that your details are correct and up to date. You can find out about your validation options and how validation works here.