asdf.md

def hello 
end

main.rb

def call(api_request)
  if api_request.class != Hash
    # log message
    return "Error"
  end
end

revise.rb

def call(api_request)
  begin 
    if api_request.class != Hash
     # log message
      raise 'Bad Input'
   end
  rescue => e 
    # log this? 
  end
end