Thank you for your contribution. You probably want to take a look at Rest API Design.

1. this line seems duplicate.
2. Your getProductData has been called in its many APIs to get the sub-field which may be cached.
3. The getData and many other APIs has a long chain in getting its field data, which may throw exception e.g. null pointer. The try-catch will hide the errors and prevent early identification of the risks - which is generally a bad idea.
4. When performing addUserToTheTeam, have you thought about multiple requests i.e. race conditions?

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