During last few days we're experiencing some delay in website stmp provider channel.
Some notification email from the website might not reaching containers.
We're working on a definitive solution.
Development and suggestions about third part tool integration.
Cordova, Xamarin, Basic4Android topics are listed here.
I tried the Apple pen with your library, it worked, but it took some time before the actual line appeared on the screen. Although it's not bad, I think it won't be comfortable for the users. I tested it on a new iPad. Do you have plans to speed it up?