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GET /graph/merchant/get - 获取商户详细信息
GET /graph/merchant/get
{ "code": 200, "msg": "获取商户信息成功", "data": { "id": "商户ID", "name": "商户名称", "email": "商户邮箱", "mobile": "联系电话", "taxNumber": "税号", "status": "状态" } }