how can i sent btc and refund blockchain

[m3n705boy]

how can i sent btc and refund to my blockchain wallet
I see some people using some software for sent btc to one blockchain to another with 0 confirmation btc, and refund the btc instantly
The method is i want to sell btc to local exchanger ex. for btc to giftcard,
he will give me address, i will send him btc, after i got the gift card, i want to refund the btc
thanks advance everyone

 

[Krustywise]

That is called double spent, and they send it on really low fees, that never hit 1/3, some exchangers i think.

 

[m3n705boy]

any link of that?

 

[ProstoPisatel]

I sent u pm. I can make doublespend

 

[Kirigaya]

Try this https://xss.pro/threads/37087/