You may still be able to get the $30 credit! 😊
If it is within 7 days since you activated your headset, all you have to do is reset your device, use a referral link, then setup your device again.
Here are the step-by-step instructions that worked for me. At the bottom is more info about the referral program.
Reset the quest device by going to the Meta Quest app -> Menu -> Devices -> Headset Settings -> Advanced Settings -> Factory Reset.
From your browser, log into:
3. Click on my referral link:
And accept the referral.
4. Put on your quest headset and set up again just like before. Note that your purchases are still there, just need to re-download them to your headset again.
5. On your Meta Quest app, go to Menu -> Wallet and you should see "Store Credit: $30"
here is beat saber 25% discount link
Hope that helps!
More info about factory reset: