voluptasmollitia/docs-exp/analytics.eventparams.promotion_id.md

Monorepo for the Firebase JavaScript SDK

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[Home](./index.md) &gt; [@firebase/analytics](./analytics.md) &gt; [EventParams](./analytics.eventparams.md) &gt; [promotion\_id](./analytics.eventparams.promotion_id.md)

## EventParams.promotion\_id property

<b>Signature:</b>

```typescript
promotion_id?: string;
```