Create/upsert subscriber
documentedCreate a new subscriber or update an existing one by email.
POST /subscribersSubscribersno implementation yet0 runsInput
email*
Subscriber email
user@example.com
name
Subscriber first name
Jane
last_name
Subscriber last name
Doe
group_id_1
Mailerlite Group ID 1
4243829086487936
group_id_2
Mailerlite Group ID 2
14133878422767533
subscribed_at
Subscribed at (yyyy-mm-dd HH:MM:SS)
2026-02-18 12:00:00
ip_address
Subscriber IP address
203.0.113.5
opted_in_at
Opt-in date (yyyy-mm-dd HH:MM:SS)
2026-02-18 12:00:00
optin_ip
Opt-in IP address
203.0.113.5
Calls MailerLite as you (your API key is your account); keychains.dev holds the credentials.