1. One-Way Follow

We want Player A to follow Player B, but B doesn't have to follow back.

The Friend API requires both players to agree, so it doesn't work for us.
Is there a BrainCloud API designed for one-way follow relationships?

Also — can GetPresenceOfUsers(profileIds[]) fetch profile data for any player,
or does a Friend relationship need to exist first?

2. Referral Rewards for Both Players

Our referral flow:

1. Player A shares their referral code
2. Player B enters the code
3. When B reaches level 3, both A and B receive a diamond reward

The challenge is rewarding A (the referrer). We store A's profile ID in a
Custom Entity when B registers the code, so we always know who referred whom.

Two questions:

a) Does BrainCloud support running a CloudCode script when a Milestone is
completed? If yes, we could use a Milestone to reward B automatically at
level 3, and use that script to look up A's profile ID and reward A as well —
no client-side trigger needed.

b) If not, is there any other server-side mechanism in BrainCloud that can
reward a different player when a specific event occurs?

Thanks!