how can i sent btc and refund blockchain

m3n705boy

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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
 
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