Read Custom scheme parameters

Hello all.
I’ve seen this question asked before but haven’t found a good answer.
Using a custom scheme, I want to pass a username into our app myapp://username=John.
I have a feeling a plugin is going to be needed but I don’t really know where to start. Can someone point me in the right direction?

Thanks.

I ended up using the DeepLink plugin for Android that’s in the Asset store.