At this time adding purchasing APIs for the different shops (Ouya, Android, Amazon, ... ?) is not the focus of this port (but in general should be possible). If you have code feell free to share and we'll see how we can integrate it.
I am very interested in making a game for OUYA using LÖVE. I am going to continue moving forward with my project, and I give my support for and would appreciate it if integrating these OUYA bits could be figured out, even if just in a tutorial form.
However, if it comes down to it, at some point along I will try to figure it out myself if it hasn't been done then.