Change customer campaign status

Mark customers in a campaign as completed, failed, or cancelled. Requires campaign_enrollment.manage. Provide customer or customers (up to 1,000), identified by customerId or US phoneNumber. Returns HTTP 202 with a server-generated job ID for both individuals and lists. Invalid customer entries fail individually with invalid_customer_reference and validationErrors; valid entries continue. Invalid request structure still returns 422. Poll statusUrl for per-input results. An optional idempotencyKey protects retries of the same payload; without one, each submission creates a new request. Customers must already exist in your organization. See Campaign API guide for restrictions and retries. This stops future campaign outreach, but does not hang up a call in progress or cancel appointments. Customers who are not in the campaign are skipped.