A memo of understanding, if signed by the parties to the contract and clearly expressing the requirements of performance by those parties and the consideration
required to obtain payment is an enforceable contract.
However, like it or not, the Republic of China remains a totalitarian state, and whenever a dispute arises between a China organization and a non-China organization, the China organization prevails in nearly every instance, unless the assets at issue are located outside of China and can be subjected to control of the courts of the non-China organization's jurisdiction
Personally, were I in your circumstances, there is no circumstance under which I would agree to jurisdiction of a China court. But, as a practical matter, because the China organization can always hide behind it's government's protection, the only way to ensure payment for services rendered, is to receive payment in advance, or in ongoing increments, so that the worst that can happen is that you lose your last payment, should the China vendor
become unhappy with your services.
Hope this helps.
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