Can I use my iPhone passcode rather than my face?
c I use my passcode with my Apple wallet rather than my face I’d?
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Yes. See the following from How to use Apple Pay - Apple Support
(Bold underline added by me)
Pay with iPhone with Face ID
- To use your default card, double-click the side button.
- Glance at your iPhone to authenticate with Face ID, or enter your passcode.
- Hold the top of your iPhone near the contactless reader until you see Done and a checkmark on the display.