2. Is it possible to mine with "asic"?
Why wouldn't it be possible? I see on the exchange they mine sha256, it is an ASIC algo for what I know.
3. If possible, they could tell me how to configure it from the stratum port to the way I want them to pay.
These are two different things. You have to configure your hardware to send shares to the stratum port. That is one thing. You can find instructions how to do that here:
http://blockmasters.co/site/get-startedOnce you have earned enough money, the payout seem to be automatic. This is from the same page:
http://blockmasters.co/site/get-startedPayouts are made automatically every 24 hours for all balances above 0.0025, or 0.0015 on Sunday. LTC Payments have a minimum of 0.05 for all payments, however we will push smaller payments twice a month. DOGE requires a minimum of 50 to be paid out.