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curl --request PATCH \
  --url https://api.getvero.com/api/v2/api/v2/campaign-messages/{campaign_message_id}/content/{id} \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "subject": "Updated",
  "content": {
    "html": "<p>Updated</p>"
  }
}
'
{
  "id": 123,
  "locale": "<string>",
  "name": "<string>",
  "is_default": true,
  "content": {
    "mjml": "<string>",
    "html": "<string>",
    "text": "<string>",
    "payload": {}
  },
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z",
  "subject": "<string>",
  "preheader_text": "<string>"
}

Authorizations

​
Authorization
string
header
required

Accepts either a raw secret key or Bearer <sk_KEY>.

Headers

​
revision
string

Optional dated API revision for the request. Must use YYYY-MM-DD format.

Pattern: ^\d{4}-\d{2}-\d{2}$
Example:

"2026-03-01"

Path Parameters

​
campaign_message_id
integer
required

Campaign message ID.

​
id
integer
required

Campaign content record ID.

Body

application/json
​
name
string | null
​
subject
string | null
​
preheader_text
string | null
​
locale
string | null

Localized contents can update locale. Note the default content variant cannot be localized in-place.

​
content
object

Exactly one of mjml, html, text or payload must be present in write requests. Email messages accept mjml, html, or text. SMS accepts text. Push accepts payload.

Response

Campaign content updated.

​
id
integer
required
​
locale
string | null
required

null for the default content variant.

​
name
string | null
required
​
is_default
boolean
required
​
content
object
required

Full body: exactly one of mjml, html, text or payload is set.

​
created_at
string<date-time>
required
​
updated_at
string<date-time>
required
​
subject
string | null
​
preheader_text
string | null