Please add China express provider SF EXPRESS

Hi, I love your app very much and enjoy it a lot!
Is it possible to add SF express as courier provider? (it's a big express player in China market)
Below is the tracking system:
http://www.kuaidi100.com/all/sf.shtml
example: 370270606236

By the way, this is not a official website of SF express. (The offical one requires verifying code, not so convenient)
But this website integrates many China couriers tracking systems at the same page.
http://www.kuaidi100.com/
And every one has a track# example on its page.
Maybe it can help to add some more China courier providers.
Thank you very much for your consistent hard-working and updates!