It is not possible to receive notifications about the flow of funds to email or phone number that is not registered to your Paysera account.
You can add an email or phone number both via app and web.
Via website: In the left-hand menu, select Settings > Payment Account > Email address > Add email address or Settings > Payment Account > Phone number > Add phone number. After adding a new email address or a phone number, make sure to save them.
When a new email address or phone number is confirmed, you will be able to select it when creating a new notification about the flow of funds in the section Settings > Payment Account > Notifications about the flow of funds.
Via mobile app: Click on the top left corner for Settings (cogwheel) > View my profile > Link additional email or Link additional phone number.