Yes, you can send their invoice to a different email by going to Manage » Members » Click on the member's name » Click on 'Edit' in the profile data section > enter billing email(s) » Update Details.
By adding a different email address here, you will override the member's primary email address, and all invoices will be sent to the new one instead. You can add multiple addresses' by separating them with a comma in this field.
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