trial_started Event - Upstack Data

Fires when a user begins a free trial. This is the start of your trial-to-paid conversion funnel.

JavaScript

window._upstack('track', 'trial_started', {
  accountId: 'acct_abc123',
  planId: 'plan_pro_monthly',
  planName: 'Pro Plan',
  trialEndDate: '2026-03-04T14:30:00.000Z',
  trialDaysRemaining: 14
});

Properties

Property	Type	Required	Description
accountId	string	Yes	Account identifier
planId	string	Yes	Trial plan identifier
planName	string	No	Human-readable plan name
trialEndDate	string	No	ISO 8601 trial expiration date
trialDaysRemaining	number	No	Days until trial expires

When to Fire

After trial signup confirmation
After trial activation in billing system
After Stripe customer.subscription.created with trial

Stripe Webhook

Maps to customer.subscription.created when the subscription has a trial period.

webinar_registered trial_activated

⌘I

​JavaScript

​Properties

​When to Fire

​Stripe Webhook

JavaScript

Properties

When to Fire

Stripe Webhook