Make a donation to the war effort. You can donate gold, War Resources, or crafted equipment. Only some NPCs will accept donations each day. Complete an active Warfront Donation quest.
Full Answer
Buy a token with the gold. Use the token and add the currency to your account instead of redeeming it for game time. Gift them game time from Bnet, you will need their email address.
Simply go to a mailbox (usually near inns), type in the character’s name, type in how much gold you want to transfer in a box lower down, and send it. Take note that sending mail also requires gold, and a subject and message in the body is optional.
Our friends here are accepting all kinds of donations on behalf of the war effort, but if ya ask me, no battle was ever won without proper funding. That's right, bub. I'm talking about money! And lots of it. If you got it, we need it!
A <class> like you's surely gotta have a little extra cash in your stash.
First, we’ll discuss the simplest method of transferring gold when one of your characters on the same realm as you main needs it: in-game mail. This approach can be used to give gold to your friends, as well, without having them be online.
For the first of the methods for transferring gold across servers, you’ll be transferring your character to another realm or server for a fee of some Blizzard credit.
A bit more expensive than transferring just one character, it has the added benefit of having no gold limit. Everything in the guild’s bank or storage will be transferred. The guild’s perks, level, and achievements go with the guild leader as well.
The other option is to bring along items to sell in the new realm. That method is a little bit trickier as market prices are not very stable, and are different across realms. To ensure minimal losses, much effort to research item prices should be exerted.