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Email questions as follow to Techsupport@xiaohongshu.com. Apply for sandbox -- Send email with subject as [Store name in RED] + [apply for sandbox]， body(data) and Response data. ， with URL， in content please provide full HTTP request， Header， please cc your Account Manager in RED. Technical questions -- Send email with subject as [Store name in RED] + [API Questions]. Error in API -- Send email with subject as [Store name in RED] + [API Error]，。