Thanks for the feedback! Responses: 1) We're working on a local stamp authentication code package for our native SDKs. We're at a pretty early stage right now,

Thanks for the feedback! Responses: 1) We're working on a local stamp authentication code package for our native SDKs. We're at a pretty early stage right now, which means we're constantly refining our algorithms and tweaking our stamp observation interface. Thus, for the time being, it is easiest (and more secure) for us to keep the authentication services on our server. We should have a local version ready in the spring, though. 2) I'm working on a major blog post about security that I'll post next week. In summary, we have several measures implemented to prevent replay attacks, including o.auth and time-gated ticketing. 3) Agreed. This is a client-specified feature. Most SMBs want it (even if their customers don't). Ces't la Vie. We have a couponing API for our native apps in private beta right now. We also have a Twilio-based SMS couponing feature that will launch soon. Thanks for your feedback!