I am travelling from the UK to Shanghai to stop for 70hrs

then onwards travel to Osaka Japan - I have been informed this will be allowed under a 144hr shanghai transit visa - Can I apply for this on arrival to shanghai airport.

I will then be travelling back to China stopping in Beijing stopping for 60hrs from Tokyo on my way to Singapore - could I therefore make use of the 72 hr free transit in Beiijing

Thanks in advance