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Variable

GTM variables read or calculate values for tag parameters and trigger conditions. They include built-in and user-defined types.

weballinPublished Sep 8, 2026Updated Sep 8, 2026

Choose inputs such as page URLs, click details, or data-layer values. Values depend on the event and evaluation time, so inspect them in Preview.

The standard GA4 purchase-amount parameter is value, not event_value. Validate its numeric type and consistency with currency and items.

References

What should I check for undefined?

Check availability timing, key names, variable type, and the actual data at that event.