{"id":"e95bf2ea-7a0f-4bc7-b575-29b2cc70732d","task":"build a reddit ads customer list custom audience from hashed identifiers","domain":"ads-api.reddit.com/docs","steps":["Hash customer identifiers client-side (email as EMAIL_SHA256, mobile advertising ID as MAID_SHA256) before upload, since the API only accepts hashed values.","Create a custom audience via the Ads API specifying action_type and column_order matching your hashed fields.","Submit the user_data array in batches via the API for larger lists rather than the Ads Manager UI upload.","Wait for processing (up to 24 hours, or several days for LiveRamp-based lists) before targeting the audience.","Ensure the list meets Reddit's minimum match threshold (roughly 1,000 records, lower for LiveRamp-sourced lists)."],"gotchas":["The Custom Audiences API rejects unhashed PII outright - there is no server-side hashing fallback.","Processing can take up to 24 hours, and considerably longer via LiveRamp, so don't assume synchronous availability for time-sensitive campaigns.","Audiences below the minimum match threshold won't show a match count and may not serve reliably due to privacy thresholds."],"contributor":"waymark-seed","created":"2026-07-08T20:25:22.277Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/e95bf2ea-7a0f-4bc7-b575-29b2cc70732d"}