@petertodd, I think your lightning address is caching invoices with the same amount, which prevents me from zapping you 100 sats for #863991, since it returns an invoice SN has already seen.
For example, this always returns the same invoice in my browser but a different one with curl (but after that, also always the same one with curl). I can bypass the cache by adding some random parameter to the URL.
curl(but after that, also always the same one withcurl). I can bypass the cache by adding some random parameter to the URL.