Sound like what we heard could be done some time back but have never seen it implemented. A plugin for a micro payments system to what ever service that can make use of it. I assume this would be good for example to implement on like a Wifi or small internet system that wouldn't even require each access point to be connected to the same firm to run it in any way to still get money for there service. so in that way you could have seamless connection to Wifi Internet from many unrelated points.
I think more examples of this systems usage is needed to get a better idea of what it is your trying to create might help. Or verify that I am on the correct page with my thoughts above on this.
Also I'm not sure about the stripe part. Seems to me the bridge to fiat to pay for the popcoin can be done with the infrastructure we already have or are creating in stellar.org. you simply need to have some set value that you peg popcoin to that you setup to auto sell on the stellar.org market with bots to keep it the value that you want it to be. At least this would be one option to start. With this method you can focus on one section of your infrastructure at a time.
But I guess stripe would come in if you want to setup a store to sell your popcoin units to be used to recharge services. There like you said you could also add periodic payments and such.
In any case the whole thing from the users perspective has to look to be simple to charge up. Much like when you pay for services like skype to make calls. you would want a site the allows purchase of your popcoin recharge whether it uses anchors we already have or you setting up of your own.
