Check out some options how pkpass files might be converted to zip format.
PKPASS files from Apple Passbook are basically ZIP files that contain the data for the coupons or tickets. So there is actually no need to convert it to ZIP, simple renaming is enough. Just word of caution, altering the files inside may break the file as whole.
Unfortunately, there is no detailed software record in the database for this conversion.
Articles and other information relating to pkpass into zip conversion:
How to open pkpass file - Additional information about pkpass files and how to open and convert them
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