post
https://a.klaviyo.com/api/text-messaging-sender-registrations
This endpoint is in beta and subject to change.
A beta revision header (2026-07-15.pre) is required to use our beta APIs. Klaviyo APIs in beta are not intended for use in production. See our versioning and deprecation policy for more information.
Submit a new registration for an existing sender (resubmission).
Rate limits:
Burst: 10/s
Steady: 150/m
Scopes:
sender-config:write