and restart bitcoind.
but the transaction fee was very low as 0.00005xxx.
how can i set the paytxfee on the version 0.12.0 as like previous version.
Its per kbyte.
so i think minimum transaction fee must be 0.0001 btc.
but it is not on the version 0.12.0
AFAIK this isnt new in 0.12. If you set 10k satoshi per kbyte and your TX is 250 byte it will pay 2.5k satoshi as fee.
Because i think fee have to be more 0.0001 to be confirmed quikly.
[1] https://bitcoin.org/en/developer-reference#estimatepriority
Id go with estimatefee[1] just keep in mind that it can return -1 which means it has not enough data so you need to catch that if you are issuing payments automatically. If you are using the GUI it will not let you slide to 1.
[1] https://bitcoin.org/en/developer-reference#estimatefee