subscribe Event - Upstack Data

Fires when a visitor subscribes to email or SMS marketing. This helps track marketing list growth and attribute new subscribers to campaigns.

Shopify: Tracked via popup/form hooks when using compatible email/SMS apps. Manual implementation may be required for custom forms.

JavaScript

window._upstack('track', 'subscribe', {
  channel: 'email',
  source: 'footer_form',
  value: 5.00,
  currency: 'USD'
});

SMS subscription:

window._upstack('track', 'subscribe', {
  channel: 'sms',
  source: 'popup',
  phone: '+15551234567'
});

Property	Type	Required	Description
channel	string	No	Subscription channel (`'email'`, `'sms'`, `'push'`)
source	string	No	Subscription source (e.g., `'popup'`, `'footer'`, `'checkout'`)
value	number	No	Estimated subscriber value
currency	string	No	ISO 4217 currency code

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