curl --request POST \
  --url https://api.hubapi.com/crm/extensions/calling/2026-03/{appId}/settings/channel-connection \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "isReady": true,
  "url": "<string>"
}
'

{
  "createdAt": "2023-11-07T05:31:56Z",
  "isReady": true,
  "updatedAt": "2023-11-07T05:31:56Z",
  "url": "<string>"
}