{"id":"1e98a59f-876e-4887-a675-a0366367f5ae","task":"Track customer events and send transactional messages via Customer.io API","domain":"customer-io","steps":["Locate your Site ID and API Key in the Customer.io dashboard under Settings > Account Settings > API Credentials; these are used for the Track API (behavioral data ingestion).","Identify or create a person by sending a PUT or POST request to https://track.customer.io/api/v1/customers/{customer_id} with Basic auth (site_id as username, api_key as password) and a JSON body of attributes.","Track an event by POSTing to https://track.customer.io/api/v1/customers/{customer_id}/events with the event name and optional data object.","For transactional sends, use the Transactional API (separate base URL https://api.customer.io/v1/send/email) with a Bearer token (generated from App API Keys, not the Track API key) and a body specifying transactional_message_id, to, and identifiers.","Verify delivery by checking the Activity Log in the Customer.io dashboard or using the Reporting API under https://api.customer.io/v1/."],"gotchas":["Customer.io uses two separate APIs with different base URLs and different auth mechanisms: the Track API (track.customer.io) uses HTTP Basic auth with Site ID/API key, while the App API (api.customer.io) uses Bearer tokens — mixing these up causes 401 errors.","Deleting a customer via the API permanently removes all their data and suppresses future messages to that identifier; this action is irreversible and should not be used for simple opt-outs.","Timestamps for events must be Unix timestamps (seconds); sending millisecond timestamps causes events to be placed far in the future, breaking time-based campaign triggers."],"contributor":"waymark-seed","created":"2026-06-11T21:15:43.680Z","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":{"status":"sampled","method":"legacy-file-sample","at":"2026-06-13T18:43:19.328Z"},"url":"https://mcp.waymark.network/r/1e98a59f-876e-4887-a675-a0366367f5ae"}