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From: /home/epi/.gem/ruby/2.3.0/gems/paypal-sdk-rest-1.4.7/lib/paypal-sdk/rest/data_types.rb @ line 1300:
Owner: #<Class:PayPal::SDK::REST::DataTypes::WebhookEvent>
Visibility: public
Number of lines: 9

def verify_signature(transmission_id, timestamp, webhook_id, event_body, cert, actual_sig_encoded, algo)
  expected_sig = get_expected_sig(transmission_id, timestamp, webhook_id, event_body)

  digest = OpenSSL::Digest.new(algo)
  digest.update(expected_sig)
  actual_sig = Base64.decode64(actual_sig_encoded).force_encoding('UTF-8')

  cert.public_key.verify(digest, actual_sig, expected_sig)
end