I'm currently building a Lightning platform for online sellers. I have found that timing can be very problematic: For example, two people want to buy the last item in stock or a unique item like a particular watch. Both proceed to checkout and receive a Lightning invoice. If both pay, the seller would have the problem to reimburse one buyer. Would it be possible for the buyers to receive a refund "automatically" at the protocol level? Or better yet, would it be possible to condition the sale of an item on only one buyer winning (e.g. by using some tweaked hash(preimage), or something like that)?
Would it be possible in any way to implement (minor) Lightning protocol changes within a Lightning subnetwork if necessary? If my platform is an app with a Lightning node itself, then I could imagine that people using this app could live in this bubble with the modified protocol, or will it be a big hassle for me to implement something like this? (I want users to create payment channels and participate in the Lightning network - at least after the purchase of an item has been properly settled!)
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