Add recipients to broadcast

curl --request POST \
  --url https://api.heyy.io/api/v2.0/{channelId}/broadcasts/{broadcastId}/recipients \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "contactsIds": [
    "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  ]
}'

{
  "data": [
    {
      "id": "<string>",
      "contactId": "<string>",
      "status": "<string>",
      "createdAt": "<string>"
    }
  ]
}