domain: developers.facebook.com/docs/marketing-api/audiences · 6 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
POST to /act_AD_ACCOUNT_ID/customaudiences with name, subtype set to CUSTOM, and customer_file_source (e.g. USER_PROVIDED_ONLY).
Capture the audience id returned and prepare your customer list with PII fields normalized and SHA-256 hashed according to Meta's requirements (email lowercase + trimmed, phone in E.164).
POST to /{AUDIENCE_ID}/users with a schema array describing the data columns (e.g. ['EMAIL', 'PHONE']) and a data array of hashed value tuples.
Batch uploads into chunks of up to 10,000 rows per request to stay within API limits.
Poll the audience's operation_status field via GET /{AUDIENCE_ID}?fields=operation_status,approximate_count until status is Normal.
Use the audience id in ad set targeting by adding it to the included_custom_audiences array in the targeting spec.
Known gotchas
Audiences with fewer than 100 matched users cannot be used for targeting; the approximate_count will show 0 until the minimum threshold is met.
Data must be hashed client-side before sending — Meta's API does not perform hashing on ingestion; sending plaintext will result in zero matches.
Custom audiences expire after a configurable inactivity period; re-upload or refresh data regularly to keep audiences active.
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