[Question]how can i change maxfeerate in sendrawtransaction? #22466

I follow the developer.bitcoin.org and try JSON-RPC in golang, but i don't know how can i change maxfeerate,there is no Examples about this, only the "hexstring". i only have 0.002 test BTC, please help me how can i change the maxfeerate

the code in golang:

hexstring := "020000000001014d4e302ec3fbda1abb365****"
fee := 0.0001
str_fee := strconv.FormatFloat(fee, 'f', -1, 64)
reqJson := "{\"method\":\"sendrawtransaction\",\"params\":[\""+ hexstring +"\", "+ fee +"],\"id\":\"sendrawtransaction\"}";
returnJson, err := rpcClient.send(reqJson)

bad-txns-in-belowout is telling you that the transaction is invalid (hexstring param), not the maxfeerate param.

Let us know if you have any other questions.

i change fee in golang, it work, maybe i just don't understand what mean maxfeerate in the page,so i'm stuck