There is no set limit to the number of passes you can store. You must manually remove passes from Apple Wallet.
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Add a pass using your iPhoneOn your iPhone, open the app, email, message, notification, or other communication that contains your pass. Tap Add to Apple Wallet. Note: Not all passes are supported by Apple Wallet. Follow the onscreen instructions or tap Add in the upper-right corner.
Yes, up to eight cards can be added to Apple Pay on a single device. The first card added to the device will become the default card, but you can change the default card.