iPhone X: 1. Double tap side button. 2. Look at iPhone X (take off sunglasses if you're wearing any). 3. Wait for prompt telling you to hold your phone near the card reader. 4. Payment gets processed iPhone 8 and earlier: 1. Hold iPhone near card reader with finger on home button. 2. Payment gets processed. I would much rather have the home button Touch ID sensor. Seems way easier and more convenient.