You can have multiple PayID types which can be linked to the same account.  However, each PayID can only be linked to one account at a time. For example, you could link both an email address and a mobile phone number PayID to the same account, or you could link an email address PayID to one account and a mobile phone number PayID to another account.

If your account is a joint account, you and each other joint account holder can each create a separate PayID for the account.