I live in a city that is about the same size as Dunkirk and would like this to be implemented (even though I walk to most places). I see this freeing parking places in the centre and that really would help with the dying local commerce in the zone.
For me the question is how are recipients selected? The main drive to use that API would be to promote doing the right thing, but for that to happen, recipient selection is a key aspect. Look for example at Kiva, you know where your money goes, why these people have been selected, and even may know how to apply for these micro-credits.
As for your questions, b) would be a demotivator to use it, and I think that 'feature' could kill the API easily on bad press.
1. We get lists of low-income people from credible non-profits that already have relationships with them (e.g., through research studies, or offering training services).
2. We conduct a number of remote audits to confirm authenticity of the list of potential recipients (phone calls, verifying account details, etc.).
3. We do a random in-person audit of recipients to ensure the poverty criteria are met.
