I am unclear about this actually. I think the actual injunction will be a separate document released soon. But here's the judge's description in the ruling:
> a nationwide injunction shall issue enjoining Apple from prohibiting developers to include in their Apps and their metadata buttons, external links, or other calls to action that direct customers to purchasing mechanisms, in addition to IAP
Obviously this would seem to imply that developers are allowed to accept payment from alternative systems to unlock digital content in apps. But it doesn't explicitly say that. All it explicitly says is that developers can link to alternative payment systems. I hope the actual injunction is more explicit.
> a nationwide injunction shall issue enjoining Apple from prohibiting developers to include in their Apps and their metadata buttons, external links, or other calls to action that direct customers to purchasing mechanisms, in addition to IAP
Obviously this would seem to imply that developers are allowed to accept payment from alternative systems to unlock digital content in apps. But it doesn't explicitly say that. All it explicitly says is that developers can link to alternative payment systems. I hope the actual injunction is more explicit.