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# FilterOperator

The comparison operator applied in a recommendation filter condition.

```
string RecommendationFilterOperator
```

## Discussion

Use these operators in the `operator` field of a [`FilterCondition`](/documentation/Apple-Ads-Platform-API/RecommendationFilterCondition). Not all operators are valid for all field types. Applying an incompatible operator returns a 400 error with a validation detail identifying the invalid condition.

For example, here’s a `BETWEEN` filter on a campaign ID range:

```json
{
  "field": "campaignId",
  "operator": "BETWEEN",
  "value": [
    "10000",
    "20000"
  ]
}
```

Endpoints that accept a `RecommendationFilterCondition` are [`Query Daily Budget Recommendations`](/documentation/Apple-Ads-Platform-API/Query-daily-budget-recommendations), [`Query Target CPA Recommendations`](/documentation/Apple-Ads-Platform-API/Query-target-CPA-recommendations), [`Query Target CPA Suggestion`](/documentation/Apple-Ads-Platform-API/Query-target-CPA-suggestion), [`Query Category Suggestions`](/documentation/Apple-Ads-Platform-API/Query-category-suggestions), [`Query Keyword Suggestions`](/documentation/Apple-Ads-Platform-API/Query-keyword-suggestions), and [`Query Phrase Suggestions`](/documentation/Apple-Ads-Platform-API/Query-phrase-suggestions).

---

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