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Verify ``validation`` using ``account_public_key``, optionally
probe tls-alpn-01 certificate and check using `verify_cert`.
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:param str domain: Domain name being validated.
:param JWK account_public_key:
:param OpenSSL.crypto.X509 cert: Optional certificate. If not
provided (``None``) certificate will be retrieved using
`probe_cert`.
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