Hi,
I suppose that you're talking about:
addtowallet.co/
From what I understand, it's a service to generate passes to be added to wallets.
I can see that this will cost at least $99 a month to be able to use their API so that the purchase of a ticket can generate automatically the corresponding pass that the user can then easily add to his wallet.
Note that Google and Apple provide their own APIs :
developers.google.com/wallet/retail/loya...ted/onboarding-guide
developer.apple.com/wallet/get-started/
While this could require more work to code, since it would require integrating with both APIs, there is a PHP library which can generate passes for both :
github.com/chiiya/passes
Its a bit more finicky to use but it doesn't cost anything.
Is there a reason why you think an Add To Wallet integration would be good ?