Create localized content
Creates localized content by cloning the message’s default content.
Omitted fields inherit from the cloned default. Optional content uses
exactly one of mjml, html, text, or payload (see CampaignContentBody).
Content can only be created while the parent campaign is in draft.
Authorizations
Accepts either a raw API key or Bearer <key>.
Headers
Optional dated API revision for the request. Must use YYYY-MM-DD format.
^\d{4}-\d{2}-\d{2}$"2026-03-01"
Path Parameters
Campaign message ID.
Body
Locale for the cloned localized content, for example fr-FR.
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 created.
List response item; body copy is omitted — fetch a single record for content.
null for the default content variant.
Full body: exactly one of mjml, html, text, or payload is set.

