seat_added Event - Upstack Data

Fires when additional seats are purchased. Use this event to measure expansion revenue from seat-based pricing.

JavaScript

window._upstack('track', 'seat_added', {
  accountId: 'acct_abc123',
  subscriptionId: 'sub_def456',
  seatCount: 15,
  seatDelta: 5,
  mrrDelta: 2500
});

Properties

Property	Type	Required	Description
accountId	string	Yes	Account identifier
seatCount	number	Yes	Total seats after addition
subscriptionId	string	No	Subscription identifier
seatDelta	number	No	Number of seats added
mrrDelta	number	No	MRR increase from seats in cents

When to Fire

When seats are purchased
When user is added beyond plan limit
When Stripe subscription quantity increases

Stripe Webhook

Maps to customer.subscription.updated when subscription quantity increases.