If you set the fields to 'Fixed' then the user will not be asked to input any information. Fixed fields are used where the information will be the same for all passes issued.

If a field will need to contain some unique information for a particular pass then you can use Dynamic Fields. If you don't want the user to be able to change this value (input some information before the pass is issued) then you can uncheck the box 'Passholder can change default value'

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