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If your iPhone has Face ID, you also use the Side button to make purchases:

 Use Apple Pay in a store. Double‐click the Side button to use your default Apple Pay card. For more about Face ID and setting up Apple Pay, see Chapter 2.

 Confirm an app or in‐app purchase. Wait until you see the Double Click to Confirm prompt shown in Figure 1.3; then double‐click the Side button to authorize the purchase. 1.3 Double‐click the Side button to authorize an app or in‐app purchase.