[Koha] How to set up SRU Server on Koha

Hi, One of our patrons are going to develop an app for our library. He asked me to provide him with an API. He wants to search for books, and then get item information. After googling around, I think that SRU might do the job. I read through koha-conf.xml and koha-conf-site.xml.in and I understand that I am to uncomment a few lines. Specifically I uncommented comments starting from line 86 and 161 in koha-conf.xml and 81 and 150 in koha-conf-site.xml.in Which port should I use? Where do I set that? Shouldn't I also set apache to listen on that port? What am I supposed to do next? Regards, Dalton