curl --request POST \
  --url https://api.hubapi.com/conversations/custom-channels/2026-03/{channelId}/channel-accounts \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "authorized": true,
  "inboxId": "<string>",
  "name": "<string>",
  "deliveryIdentifier": {
    "type": "CHANNEL_SPECIFIC_OPAQUE_ID",
    "value": "<string>"
  }
}
'

{
  "active": true,
  "archived": true,
  "authorized": true,
  "channelId": "<string>",
  "createdAt": "2023-11-07T05:31:56Z",
  "id": "<string>",
  "inboxId": "<string>",
  "name": "<string>",
  "archivedAt": "2023-11-07T05:31:56Z",
  "deliveryIdentifier": {
    "type": "CHANNEL_SPECIFIC_OPAQUE_ID",
    "value": "<string>"
  }
}