Both A and B systems are managed by our team, so the development freedom is higher.
A and B need to synchronize some data with each other, such as synchronizing purchase orders. Both A and B have tables of orders, but the structure is not the same, and data matching is required.
I mainly think of two schemes. One is to design an intermediate data structure (or object). This structure is established on both A and B systems. No matter which system needs to synchronize data, it is first converted into this intermediate structure.