To make contributions towards the current ARMA III Exile Mod server please go here: U4EA Game Server Contributions
If you want to donate towards a different game server please donate and then send us a message through our Contact Us page mentioning what kind of server you would like us to allocate the funds towards.
The minimum is 5 Pounds, we can't change the minimum amount unfortunately as it's set by GTX Gaming.
Also any donations made this way remain in the GTX server account meaning the funds to towards game severs according to the wishes of those who contribute.
Thank you in advance,