抖音小程序的回调参数：{"msg":"{\"appid\":\"tt135265ef8c6d33ef01\",\"cp_orderno\":\"YP230329151927d3416d7c37134b\",\"cp_extra\":\"\",\"way\":\"1\",\"channel_no\":\"4347201113202303290178274004\",\"channel_gateway_no\":\"\",\"payment_order_no\":\"PCP2023032915224529654758406785\",\"out_channel_order_no\":\"4347201113202303290178274004\",\"total_amount\":1,\"status\":\"SUCCESS\",\"seller_uid\":\"72058211427313441430\",\"extra\":\"\",\"item_id\":\"\",\"paid_at\":1680074590,\"message\":\"\",\"order_id\":\"N7215864582118574351\",\"ec_pay_trade_no\":\"NEP2023032915195735863270406785\"}","msg_signature":"3b13a62abf86724a2ccb7884da56c018d1bb5639","type":"payment","nonce":"4367","timestamp":"1680074590"}

而我用抖音开放平台的demo生成的签名是35816e4af2e15eb617fc76b56bb3ab1f50a3d4d1