I send payment for 5 units allowed by my coupon 0.1 coupon (.5 btc) and send a shipping label as instructed in the OP.
I get a PM saying I need to send 0.15 btc per coupon and that the cost is 0.15.
Why is the cost of a 0.10 coupon 0.15 when shipping has already been paid?
This is a total scam!