Does not seem like this works off the box. One of our customers tweeted with a stipe buyable product link [1] (from stripe relay) and the buy buttons are not there on twitter.
Support from stripe on this has not been great either with one of their support staff confirming and the other asking us to write to twitter about it.
Has anyone else had success with buyable tweets and stripe relay ?
[1] https://twitter.com/lienielsen/status/646708462043402240