Design a vending machine for people with disabilities.

To design a vending machine accessible to visually impaired individuals, I would focus on the following key features:

1. Auditory Feedback: Implement a voice-guided interface that announces product options, prices, and payment instructions. This can be activated by a button or proximity sensor.
2. Tactile Interface: Use raised buttons with Braille labels for selection and payment. The keypad should have a distinct tactile layout.
3. Large Print and High Contrast Display: For users with low vision, the screen should offer adjustable font sizes and high-contrast color schemes.
4. Accessible Payment Options: Support contactless payments (NFC) and provide clear audio and tactile cues for inserting cash or cards.
5. Product Retrieval: Ensure the dispensing slot is at an accessible height and provides clear auditory confirmation when the product is dispensed.
6. Emergency/Assistance Button: Include a clearly marked button that connects the user to customer support for immediate assistance.

The primary goal is to increase machine usage among visually impaired customers by making the entire transaction process intuitive and navigable through non-visual cues.