To a https://api.ngsm.nexon.com/v2/token.data sends the Request, the content is not important, feel free to write a thing can be temporarily, if return status is not a Bad 400 Request, can find out the reason of course better, so short answer, but as it is Bad to get short answer,

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400 error, are generally parameter errors, is the parameter type does not match, conversion failed.
String turn int, for example, there is time format conversion, etc.

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General API to API key? First to see the development of the document, the client to guess in the next century are not necessarily can guess,

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405

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See the corresponding API interface specification,,,

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400 also have can be request permissions