redeemQuickInviteLink(link, callback) {
		return StdLib.Promises.timeoutCallbackPromise(10000, null, callback, true, (resolve, reject) => {
			let match = link.match(/^https?:\/\/s\.team\/p\/([^/]+)\/([^/]+)/);
			if (!match) {
				return reject(new Error('Malformed quick-invite link'));
			}

			let steamID = Helpers.parseFriendCode(match[1]);
			let token = match[2];

			this._sendUnified('UserAccount.RedeemFriendInviteToken#1', {
				steamid: steamID.toString(),
				invite_token: token
			}, (body, hdr) => {
				let err = Helpers.eresultError(hdr.proto);
				if (err) {
					return reject(err);
				}

				// No response data
				resolve();
			});
		});
	}
Redeem a quick-invite link and add the sender to your friends list.
@param {string} link
@param {function} [callback]
@returns {Promise}