I don't know them, but my sister knows them, but I have decided to ask if I can send it to them via email.
Viewing post in How do I give keys to beta testers
There was this kinda tip in the faq that can apply to your beta testing. You can give out one of those keys to several people. But better read it again yourself.
If you'r looking to give out access to your game to a friend, or press, we recommend generating a single key. If you need to generate many keys, like for a promotion on another site, then we recommend the bulk generator.
Individually generated keys give you finer control over the key: you can set a label for easy identification, track how often it’s been used to download, and revoke it if necessary.
Also, I think you can set your project to hidden or something and just give out the link. No need to generate keys, if you have no payment active anyways. Those keys are for the situation where something is paid content but you want to give access to someone that did not pay.