I'm getting a message saying "An opt-in link will be available here when you publish your app", but I don't know what else I need to do publish my alpha test apk.
The release status says "full rollout", which indicates to me that everything is done.
I know it takes hours for it to appear but I already waited for days. What do I need to do to get this URL? If I sideload the apk that I created, will it be the same as downloading from the store (in terms of IAP authorisation)?
For many developers, it's just a matter of time. Rolling out merely gets you to the Pending publication stage. After some time you reach the Published stage and the URL will appear.
However, for your app, it looks like this app in unpublished. You can't opt-in to unpublished apps, so the opt-in link isn't shown.
For questions like this the Developer support team are usually really good, and we do have bugs sometimes, so it is always worth asking them.
It's just a matter of time
- Rolling out merely gets you to the Pending publication stage
- After some time (say 45 minutes) you will reach the Published stage and the Opt-in URL
Google need to do a much better job of stating what is going on. No where on the App Releases screen does it state that its "pending publication". I wasted an hour trying. to figure this out when mine was in "Pending Publication" state. Also why is the Manage Testers section of the screen default to closed. Its one of the primary functions of the screen. Instead I had to discover a tiny soft grey button off to the upper right of my large display... Ughhhhh!!!
来源：https://stackoverflow.com/questions/48256603/where-is-the-opt-in-url