Create Client Subscription

Create a new subscription for the given list ID and channel:

  • Email email
  • SMS phone_number

This endpoint is specifically designed to be called from publicly-browseable, client-side environments only. To create subscriptions from server-based applications, please use POST /api/profile-subscription-bulk-create-jobs

Rate limits:
Burst: 100/s
Steady: 100/m

Scopes:
Subscriptions Write

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