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微信H5支付V3版本接口,一直返回签名错误不知道是什么原因

{"code":"SIGN_ERROR","detail":{"detail":{"issue":"sign not match"},"field":"signature","location":"authorization","sign_information":{"method":"POST","sign_message_length":860,"truncated_sign_message":"POST\n/v3/combine-transactions/h5\n1604047493\nnmudbx23.etb\n{\"combin\n","url":"/v3/combine-transactions/h5"}},"message":"验签失败,请检查签名\t"}

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