Edit a draft campaign

PATCH /api/v1/campaigns/{campaignId} Edits a draft campaign. A campaign is created with a copy of its template's HTML, then lives on its own: this endpoint edits that copy — the HTML actually sent — without touching the template. A campaign that has already been sent or is sending is frozen and returns 400. Every field is optional; only those you send are changed. Mailchimp merge tags in the HTML are converted as on template creation; any unsupported tag is returned in unsupportedTags.

Authorization

Role in the organization	This endpoint
`OWNER`	Allowed
`ADMIN`	Allowed
`MEMBER`	Refused — `403`

A key carries the role its creator holds in this organization — never a role on AgentsMail itself. See API keys.

Request body

Field	Type	Required	Description
`content`	string	no	The HTML of the email
`subject`	string	no	1 to 200 characters
`name`	string	no	1 to 100 characters
`listId`	string	no	Retargets the campaign; must belong to the org
`tagId`	string	no	Narrows the target to a tag, or `null` to clear
`templateId`	string	no	Re-links the source template; must belong to the org
`sendingIdentityId`	string	no	Changes the signing address, or `null` to fall back to the default

Example

bash

curl -X PATCH -H "x-api-key: $AGENTMAIL_API_KEY" -H "content-type: application/json" \
  https://www.agentsmail.io/api/v1/campaigns/$CAMPAIGN_ID \
  -d '{ "content": "<html><body><p>Hi {{firstName}}</p><a href=\"{{unsubscribeUrl}}\">Unsubscribe</a></body></html>" }'

Response

200 OK — the call succeeded.
401 Unauthorized — missing or invalid key, or its owner left the organization.
403 Forbidden — the key's owner is a member of the organization, not an admin.
404 Not Found — no such resource, or it belongs to another organization. The API never confirms that an id exists to a caller who has no right to it.
429 Too Many Requests — over 120 requests in a minute for this key.

Response fields

Field	Type	Description
`success`	boolean	Indicates if the operation was successful
`data.id`	string	Unique identifier for the campaign
`data.name`	string	Its internal name
`data.subject`	string	The subject recipients see
`data.status`	string	`draft`, `scheduled`, `sending`, `sent`, `failed`
`data.listId`	string	The list it targets
`data.tagId`	string	null
`data.segmentId`	string	null
`data.scheduledAt`	string	null
`data.sentAt`	string	null
`data.createdAt`	string	ISO creation date
`data.updatedAt`	string	ISO date of the last change

Example response

json

{
  "success": true,
  "data": {
    "id": "4d19c0a2",
    "name": "Newsletter",
    "subject": "August news",
    "status": "subscribed",
    "listId": "0b7c51e8",
    "tagId": "7c2ef4b1",
    "segmentId": "3f81aa2c",
    "scheduledAt": "2026-08-23T10:22:05.000Z",
    "sentAt": "2026-08-23T10:22:05.000Z",
    "createdAt": "2026-08-23T10:22:05.000Z",
    "updatedAt": "2026-08-23T10:22:05.000Z"
  }
}