S: Sponsor sets slot email
Q: Attempt invitation events
C: Recipient receives notified code
L: Email-matched member lists invitations
K: Returned activation code
A: Active member submits intended code
I: Existing code supplied by issuer
G: Gift membership branch
M: Multi-seat parent membership branch
W: Attempt slot activation and events
D: Separate account and access inspection
F: Gift recipient payer-off choice
P: Attempt parent payer-flag change
S → Q
Q → C: If delivered
L → K
C → A
K → A
I → A
A → G
A → M
G → W
M → W
W → D
F → P