post
https://a.klaviyo.com/api/text-messaging-senders
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.
Create a sender and submit its initial registration.
A toll-free number is provisioned in all supported regions (US + CA), so
the response is the sender for the requested country and the
sibling-region sender also appears in list/retrieve.
Rate limits:
Burst: 10/s
Steady: 150/m
Scopes:
sender-config:write