Hi, there:

I am reading through the develop links, it mentions that we can register a callback URL
for event monitor:

http://developer.ultrain.io/tutorial/contract_tutorial

0_1538576834627_9885f1dd-3890-46b7-9bcf-da5257a94063-image.png

The example show a local test net. Now what RPC URL I should use for the official test net that I can interact with the ultrain explorer (http://explorer.ultrain.io/)

Looking forward your answer.

Thanks!