Paypal: Backup Codes are a common backup plan for authenticator app and are used by many major industry and security leaders in that industry. The also help prevent social engineering tactics used more and more often every day, and would be employed were I need to call, as you suggested. Please provide this feature. Having my phone number as a secondary 2-step authentication almost causes more vulnerabilities than it prevents, as it has been shown to be very vulnerable to man in the middle attacks.
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