Personalize the preview for a contact

<Warning> **Coming soon.** This endpoint will be available by early July 2026. </Warning>

<small>Requires the ai-sdr:write scope (or a broader one that includes it).</small>

Kicks off (or re-runs) AI personalization for a single contact in an AI SDR sequence.

Personalization runs step-by-step in the background. The whole step chain for the contact is tracked by a single background job: the response returns its jobId, and progress advances as personalizedSteps / totalSteps. Poll the generic GET /v3/background-jobs/{id} endpoint for status and progress; on completion the job's jsonDataResult carries { sequenceId, contactId, personalizedSteps, totalSteps }. A chain that ended early (for example, the contact was removed mid-chain) reports personalizedSteps < totalSteps.

Requires the AI SDR feature on the caller's team.