AhmedAliIbrahim

class Alien
  def can_talk_to?(character)
    character.is_a?(Human) || character.is_a?(Alien)
  end
end

AhmedAliIbrahim

# key is payfort passphrase request or response 

def sign_with_key(params, key)
  string_to_digest = params.sort { |a, b| a[0].upcase <=> b[0].upcase }.map { |k, v| "#{k}=#{v}" }.join()
  string_to_digest = "#{key}#{string_to_digest}#{key}"
  Digest::SHA256.hexdigest(string_to_digest)
end