https://www.meta.com/referrals/link/quc14556
Get $30 bouns if you're new to Meta Quest. Use the link and accept the referral to create a new account. Once you use the new account to activate your new Quest device, you'll receive the bonus credits to your Meta Quest Store.
Meta Quest 新用户邀请，激活后可获赠 $30 美元。Meta Quest 新用户可使用上述邀请链接注册新用户，当你使用新账户激活你的新 Quest 设备时，将获得额外的 $30 商店余额。
Only new account or an account never accepted referrals before and have no actived devices can be applied. If you've already activated your Quest device in a day but haven't accept any referrals, you can remove the device from your account and factory reset your device, accept the referrals, then activate it again.
仅限新账户或从未接受过邀请且目前没有设备的账户。如果你在当天激活了新的 Quest 设备但没有接受过邀请，可在帐号内移除设备并出厂重置设备，然后接受邀请链接，再重新激活设备。
If you already have a primary account, consider register a new Meta account to accept the referral, then use multiple accounts feature to share the game library (but developer mode is only available for device's administrator account). Though... why not just use your primary account's referral? 如果你已经有一个帐号了，可以考虑注册一个新的 Meta 帐号来接受邀请，然后通过多账号功能来共享游戏库（不过开发者模式仅与设备的管理员帐户关联）。虽然……为什么不直接用你的主帐号的邀请呢？
I guess probably not? Since my Quest 3 device has some issues, I requested a RMA and reset the old device, but my new device is not arrived yet, so I'm not sure if you can accept the referral for now.
If you saw a message said "You're all set" when you accept the referral, then it's fine. But for safety, you can try the link above which linked to my Quest 2 device, and it should be valid.
https://www.meta.com/referrals/link/quc14556
Or if you're uncertain, you can also try finding referrals on reddit (I guess there's a subreddit to share referrals) or somewhere else.