getEncryptedAppTicket(appid, userData, callback) {
		return this.createEncryptedAppTicket(appid, userData, callback);
	}
Request an encrypted appticket for a particular app. The app must be set up on the Steam backend for encrypted apptickets.
@param {int} appid - The Steam AppID of the app you want a ticket for
@param {Buffer} [userData] - If the app expects some "user data", provide it here
@param {function} [callback] - First argument is "err", second is the ticket as a Buffer (on success)
@return {Promise}
@deprecated Use createEncryptedAppTicket instead