Reference
Glossary
Shared terms used across your Constant Contact for Agents account, public REST API, and OpenAPI reference.
| Term | Definition |
|---|---|
| API key | Bearer credential used by server-side integrations. Send as Authorization: Bearer <API_KEY>. |
| Workspace | Scoped environment for keys, domains, sends, usage, billing, and webhook configuration. |
| Sending domain | Domain identity used in sender addresses after DNS verification. |
| Verification records | DNS records returned by /v1/domains that prove domain control and sending readiness. |
| Message class | Classification for send intent. The current public send path supports transactional. |
| Send | Asynchronous delivery request. Send-creating endpoints return a send_id that can be queried later. |
| Idempotency key | Client-supplied key that prevents duplicate send creation during retries. |
| Webhook endpoint | HTTPS URL that receives signed event delivery POST requests. |
| Signing secret | Secret used to verify X-CTCT-Signature. Create and rotate responses return it once. |
| Delivery history | Webhook delivery attempts and statuses returned by /v1/webhook-events. |
| Rate limit reset | Unix timestamp in X-RateLimit-Reset that indicates when a request bucket resets. |