Create Client Subscription

documented

Subscribe a client profile via client-side API (beta in some versions).

POST /client/subscriptionsClient APIno implementation yet0 runs

No implementation yet. Run it to have the agent write one, or open a pull request with your own.

Seed example (keychains curl)

npx -y keychains@latest curl "https://a.klaviyo.com/client/subscriptions?company_id={{KLAVIYO_API_KEY}}" \
  -X POST \
  -H "Content-Type: application/json" \
  -H "revision: 2026-01-15" \
  -d '{"data": {"type": "subscription", "attributes": {"profile": {"data": {"type": "profile", "attributes": {"email": "{{$email}}", "phone_number": "{{$phone_number}}", "subscriptions": {"email": ["{{$email_subscription_tier}}"], "sms": ["{{$sms_subscription_tier}}"]}}}}}} }'