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你好微信商户代金券发放提示错误签名

string(447) "{"code":"SIGN_ERROR","detail":{"detail":{"issue":"sign not match"},"field":"signature","location":"authorization","sign_information":{"method":"POST","sign_message_length":266,"truncated_sign_message":"POST\n/v3/marketing/favor/users/oapaX5OxSfqxcUd1e_JhfLLiD7Yw/coupons\n1577959483\nhzb9usvdjw6y2hxdzvpcxhlirkcxcorb\n{\"stock_\n","url":"/v3/marketing/favor/users/oapaX5OxSfqxcUd1e_JhfLLiD7Yw/coupons"}},"message":"错误的签名,验签失败"}"

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