'side' => 'buy', 'ordType' => 'market', 'sz' => 100, ); //比如下单,待加密字符串 $str = 'POST/api/v5/trade/order'.json_encode($param); $timestamp = date('Y-m-d\TH:i:s.z\Z'); $sign = base64_encode(hash_hmac("sha256", $timestamp . $str, $secret_key, true));...