RETL Meta Destination

condor-retl-meta is the active first-party Meta Ads destination connector package for the State/Event architecture. It exposes retl/meta through the retl.destinations entry point group.

Surfaces

• custom_audiences accepts targeted State Operations and sends Meta Custom Audiences add/remove users requests. It accepts email, phone_e164, and mobile_advertising_id Identifiers and requires at least one of those accepted types. The surface supports managed targets: when a State row emits a logical target that is not mapped or already present in the runtime Target Registry, the connector looks for an existing Customer File Custom Audience with that exact name and creates one when missing.
• events accepts Event imports and sends Meta Conversions API event requests. It accepts email, phone_e164, and external_id Identifiers and requires at least one of those accepted types. Event bindings require action_source and either a single pixel_id or an event_routes mapping from Event name to pixel id. Payload fields fbc, fbp, client_ip_address, client_user_agent, event_source_url, and opt_out are rendered into the Meta Conversions API request shape; remaining payload fields become custom_data. Optional test_event_code is sent at the request body level.

Both surfaces use bearer-token auth with the access_token credential field. Both surfaces declare delivery_outcome="succeeded" because successful Meta responses provide definitive per-request success evidence. Dry runs plan request batches and do not submit membership or event mutations. For managed Custom Audiences, dry runs may issue read-only lookup requests to determine whether a target would be reused or planned for creation.

The access token may be loaded with:

credential_namespace="destinations.meta"

which creates retl.secrets["destinations.meta.access_token"] without resolving the token during binding construction.

Identifier Rendering

Meta hashed matching identifiers are rendered with RETL's shared destination SHA-256 helpers. For Custom Audiences, email and phone_e164 values are lowercased and hashed unless the input is already a 64-character hexadecimal SHA-256 value, in which case it is trimmed, preserved, and lowercased. mobile_advertising_id is trimmed and sent unhashed.

For Conversions API Events, email and phone_e164 use the same lowercase hash-or-preserve behavior. external_id is also rendered as SHA-256, but it is not lowercased before hashing; 64-character hexadecimal input is preserved as a pre-hashed value. The connector does not add email, phone, or external-id format validation beyond existing non-empty request-rendering checks.

Binding Config

Shared config:

• ad_account_id is required and may be provided with or without the act_ prefix.
• api_version defaults to v25.0 and is normalized without leading or trailing slashes.
• transport may be injected for offline tests. When omitted, non-dry-run submissions use the connector's requests transport.
• custom_audience_customer_file_source defaults to USER_PROVIDED_ONLY and may be set to PARTNER_PROVIDED_ONLY or BOTH_USER_AND_PARTNER_PROVIDED when creating managed Customer File Custom Audiences.

The connector owns the production API origin https://graph.facebook.com in package code. Tests use injected transports to capture requests without changing that origin. base_url is not a Meta config field and should not appear in Meta TOML examples, even as a commented placeholder.

ad_account_id, api_version, and custom_audience_customer_file_source are namespace-loadable public config:

destination = retl.destinations.load(
    "retl/meta",
    binding_name="meta_primary",
    credential_namespace="destinations.meta",
    config_namespace="destinations.meta",
)

The namespace can provide DESTINATIONS__META__AD_ACCOUNT_ID, DESTINATIONS__META__API_VERSION, and DESTINATIONS__META__CUSTOM_AUDIENCE_CUSTOMER_FILE_SOURCE. Event routing values such as pixel_id or event_routes remain explicit because route mappings are not inferred from namespaces.

Managed Custom Audience lifecycle uses Meta's documented Customer File Custom Audience flow: read from /customaudiences under the ad account, create an empty audience with subtype=CUSTOM and customer_file_source, then submit membership rows to /{audience_id}/users. Dry runs may perform the read needed to identify existing audiences, but do not create audiences or write Target Registry rows.

events config:

• action_source is required.
• Provide either pixel_id for a single route or event_routes to map Event names to pixel ids.
• Optional test_event_code is included in the request body for Meta test events.

Config parsing, URL joining, transport lookup, and diagnostic sanitization live in retl_meta.common. Partner request translation, identifier rendering, and target/event routing live in retl_meta.hooks.

Final submission applies runtime-resolved bearer auth headers when building each HttpRequest. Request planning remains auth-free and secret-free, so dry-run request plans stay deterministic and redacted.

Proof Level

Default tests provide:

1. Contract proof for package loading, connector metadata, surfaces, auth, and evidence shape.
2. Translation proof for Custom Audiences State Operations and Conversions API Event Imports without network access.
3. Mocked transport proof for request rendering, target mapping, route selection, managed Custom Audience find/create, runtime-store-backed target registry lookup, resolved auth placement, response classification, redacted diagnostics, transport failure handling, selected request-plan reuse, and destination batch ledger behavior.

Sandbox

Live sandbox tests are opt-in:

source local/env/.env.meta-sandbox
make test-sandbox-meta

Default repository checks exclude live_sandbox tests and do not contact Meta.