Apple VAS passes are available on request. Please contact us with a detailed description of your use case so we can sort out the details. Specifics are subject of an NDA.
In general you can integrate any NFC device (e.g. a credit card terminal) that supports Apple VAS. As soon as a user taps his phone and has a pass of your business on his phone, the pass will be shown automatically and can be redeemed.
VAS is supported on all iPhones that have an NFC module (since iPhone 5S).
Check out the detailed instructions here.