I dunno if you're joking or not. But that site just screams SCAM!
There is nothing they can do to ensure your transaction gets picked up faster .
VIA BTC runs an accelerator, and it's free, https://www.viabtc.com/tools/txaccelerator/

But they are a huge mining pool and are using that accelerator to spread the word about BU.

For the record TradeQwik is running a full Bitcoin Unlimited node for our hotwallet as a sign of support.

But please make sure to emphasize that this credit card thing is most likely a scam before some poor sod buys into it.