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Log in to your GraphHopper account. On the main page you will see a button called Invoice and Payment Data. This button opens a mask where you can change your personal data like email and address.
Log in to your GraphHopper account and just click on the email in the upper right corner. Then you can change your email.
This also automatically changes the email to which your invoices are sent, i.e. if the invoices are to be sent to a different email, you must go back to Case 1.