/v2/campaigns/:id/leads/:leadId/replySends caller-supplied content threaded onto this lead's existing conversation — a reply you write, not the campaign's template and never AI-personalized. Requires the lead to have a prior sent message to thread against.
| Authorization | Bearer YOUR_API_KEY |
| Content-Type | application/json |
| Field | Type | Required | Description |
|---|---|---|---|
| id | string | Required | Campaign ID. |
| leadId | string | Required | Lead ID. |
| body | string | Required | HTML (or plain text) content of the reply. 1–800,000 characters. |
| subject | string | Optional | Subject line, up to 998 characters. Omitted defaults to "Re: " + the campaign's original subject. |
curl -X POST "https://api.stynar.com/v2/campaigns/cmp_abc123/leads/lead_1a2b3c/reply" \
-H "Authorization: Bearer esk_your_key_here" \
-H "Content-Type: application/json" \
-d '{"body":"Hi Jane, happy to send over that case study — here'"'"'s the link: ..."}'{
"queued": true
}| Status | Code | Meaning |
|---|---|---|
| ✕ 404 Not Found | NOT_FOUND | Campaign or lead doesn't exist or isn't yours. |
| ✕ 401 Unauthorized | UNAUTHORIZED | Missing, malformed, unknown, revoked, or expired key. |
| ✕ 403 Forbidden | API_ACCESS_DISABLED | API access is turned off for your account. |
| ✕ 403 Forbidden | INSUFFICIENT_SCOPE | The key doesn't have the scope this endpoint requires. |
| ✕ 409 Conflict | CONFLICT | The action can't be applied to the resource's current state. |
| ✕ 429 Too Many Requests | RATE_LIMIT_EXCEEDED | Per-minute or per-second limit hit. |
| ✕ 429 Too Many Requests | QUOTA_EXCEEDED | Monthly quota exhausted. |
| ✕ 500 Internal Server Error | INTERNAL_ERROR | Something broke on Stynar's end. |