only BTC acceptable or other currencies?
You can take a look at their
banking page to see what currencies are accepted aside from bitcoin.
Do you have referral option? so that i can refer someone
https://affiliates.casinoadrenaline.com/ I think this is the one you are looking for but better to ask live support first to confirm whether it is official affiliate page of casinoadrenaline or not as I found it by searching on google as I could not find it on the main website.