Tokyo-Shanghai-Munich - part2

Hello, thank you for answering my question from last time. can I declare the 72h transit on my own or do i really have to contact the airline. If I can declare it on my own, will it be much more complicated than with the airline?

I will arrive in Shanghai with Macau airline and leave Shanghai with Turkish Airline. If the airline has to declare it, which airline should I contact?

Thank you very much for answering in advance.