[awesome_dude]

Sorry, can they (customers) demand it back?

I mean, once Starbucks have it, then the customers get it back via product (that has a margin included), or just leave it forever (free money!)

I have a firm "No vouchers" rule because of this, the vouchers in my part of the world inexplicably "expire" if not used within a certain amount of time, cannot be redeemed for cash, and will not be honoured if the business goes belly up

[consp]

According the laws here they have to. Doesn't mean they won't make it difficult. And it needs to be in a separate account and business (to avoid it being drawn into a bankruptcy). Not that this has ever stopped businesses from abusing it anyway. I doubt this voucher option is available in the Dutch app because of this but I didn't bother to check.