There are two types of products on Amazon in Germany. One is self-operated by Amazon, a company like JD.com, which has a high credibility, but the price is not very cheap. The other is Amazon provides a platform for other small companies. The prices operated by the above companies are generally lower, but their credibility is not as high as Amazon. However, German online shopping companies are generally much more reliable than domestic ones.
Generally, Amazon Germany only reports the postage within Germany or Europe. Postage will definitely be added to China. After the goods arrive in China, Chinese customs will conduct random inspections. If they are caught, you will have to go to the customs to declare taxes. Amazon will usually put the bill in the package, so if it is found, you will still have to pay more tariffs, depending on the product category.