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2. Telephone number verification - Wikipedia

   en.wikipedia.org/wiki/Telephone_number_verification

   To verify that a telephone number exists and authorize its use, subscribers supply a telephone number on which to establish service, often via a web page. A unique code is first indicated or displayed to the customer via the web site, then an automated call is then placed to the supplied subscriber telephone number.

3. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

4. Check verification service - Wikipedia

   en.wikipedia.org/wiki/Check_verification_service

   Outside the United States the decline in check usage in favour of debit cards and credit cards has meant that cheques are rarely accepted by merchants thus rendering cheque verification services obsolete. In the United States, there are a number of third-party companies that provide check verification services.

5. Identify legitimate AOL websites, requests, and communications

   help.aol.com/articles/identify-legitimate-aol...

   • Fake email addresses - Malicious actors sometimes send from email addresses made to look like an official email address but in fact is missing a letter(s), misspelled, replaces a letter with a lookalike number (e.g. “O” and “0”), or originates from free email services that would not be used for official communications.

6. Luhn algorithm - Wikipedia

   en.wikipedia.org/wiki/Luhn_algorithm

   The Luhn algorithm or Luhn formula, also known as the "modulus 10" or "mod 10" algorithm, named after its creator, IBM scientist Hans Peter Luhn, is a simple check digit formula used to validate a variety of identification numbers.

7. Third-party verification - Wikipedia

   en.wikipedia.org/wiki/Third-party_verification

   Third-party verification adds an important element of proof to electronic transactions. For example, in a just-completed experimental study of consumer reactions to electronic contracts, over 80% of respondents agreed that a transaction was harder to dispute because the verification was made and held by an independent third party.