How they get it 250$ FB Ad credit in 2019

How they get it 250$ FB Ad credit in 2019
Many people started in 2019 to sell Facebook ads credit up to 250$ (it is very expensive 170$ per coupon)

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I know that coupons have been ended few years ago, But they sell it now also for old accounts and can be redeemed many times to the same account

Do any one know any thing about this method.

P.S: I'm not selling any vouchers, I want to know the method even if I pay for it

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