# PATCH /email-campaigns/:campaign_id/sends/:send_id

**Resource:** [Email Campaigns](./email-campaigns.md)  
**MCP tool:** `update_email_blast_run`  
**Scopes:** `email-blasts:write`  
**Write operation:** yes

Edit a SCHEDULED run of an email blast before it sends: its content (subject, intro_text, body_html, cta_text, cta_url), its audience (segment_filter), or its send time (scheduled_for). Each scheduled run carries its own copy, which is how a series of sends can say something different each time (invite, then reminder, then last call) without touching the blast itself. Only runs with status 'scheduled' can be edited; a run that has already sent is a permanent record.

## Parameters

| Name | In | Type | Required | Description |
|------|----|------|----------|-------------|
| `campaign_id` | path | string | yes |  |
| `send_id` | path | string | yes | The run to edit, from list_blast_runs. |
| `subject` | body | string | no | Subject line for this run only. |
| `intro_text` | body | string | no | Intro text for this run only. |
| `body_html` | body | string | no | HTML body for this run only. |
| `cta_text` | body | string | no | CTA button text for this run only. |
| `cta_url` | body | string | no | CTA button URL for this run only. |
| `segment_filter` | body | object | no | Audience filter for this run only, same shape as the blast's segment_filter. |
| `scheduled_for` | body | string | no | New ISO 8601 send instant. Also moves the queued send. |
| `require_approval` | body | boolean | no | Optional. Set true to route this write into the approval queue for human review instead of executing it immediately (returns 202 + an approval_id). Works even when your key/token has permission to execute directly. |

## Request example

```bash
curl -X PATCH   "https://api.trustpager.com/functions/v1/api/v1/email-campaigns/:campaign_id/sends/:send_id"   -H "Authorization: Bearer YOUR_API_KEY"   -H "Content-Type: application/json"   -d '{"subject":"...","intro_text":"...","body_html":"..."}'
```

---
Base URL: `https://api.trustpager.com/functions/v1/api/v1` — Auth: `Authorization: Bearer YOUR_API_KEY`