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It takes a few minutes to complete the survey, so it's easy. Entering their receipt code is all that customers have to do. Answering a few questions about their experience and having a Jack in the Box receipt would be helpful. Redeeming the free Supreme Croissant or Jumbo Jack code is required. Hello! I'm happy to have you here. What are your favorite Subway menu items? salads and submarine sandwiches (subs) or popcorn nuggets? Do you enjoy the personnel and service there.