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Fires when a trial is about to expire (typically 3 days before). Use this event to trigger conversion campaigns and win-back flows.

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JavaScript

window._upstack('track', 'trial_ending_soon', {
  accountId: 'acct_abc123',
  trialDaysRemaining: 3,
  planId: 'plan_pro_monthly',
  trialEndDate: '2026-03-04T14:30:00.000Z'
});

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Properties

PropertyTypeRequiredDescription
accountIdstringYesAccount identifier
trialDaysRemainingnumberYesDays until expiry
planIdstringNoTrial plan identifier
trialEndDatestringNoTrial expiration date

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When to Fire

  • 3 days before trial expires (common)
  • When Stripe sends customer.subscription.trial_will_end
  • When automated warning email triggers

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Stripe Webhook

Maps to customer.subscription.trial_will_end.