Update campaign
documentedUpdate a draft campaign.
PUT /campaigns/{campaign_id}Campaignsno implementation yet0 runsInput
campaign_id*
Campaign ID
12345
name
Campaign name
e.g. Spring Sale 2026
language_id
Language ID
e.g. 1
subject*
Email subject
e.g. Welcome to Spring
from_name*
From name
e.g. Acme Marketing
from_email*
From email address
e.g. marketing@domain.com
content*
Email content
HTML content
reply_to
Reply-To email
e.g. reply@domain.com
group_ids
Group IDs
e.g. 101,102
segment_ids
Segment IDs
e.g. 201,202
Calls MailerLite as you (your API key is your account); keychains.dev holds the credentials.