curl --request POST \
  --url https://app.herondata.io/api/end_users/{end_user_id_or_heron_id}/bulk_category_feedback \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "category": {
    "heron_id": "ctg_9bVVpryziBmQUhxNUax7Vo",
    "label": "Insurance"
  },
  "source": null,
  "transaction_heron_ids": [],
  "transaction_reference_ids": []
}
'

{
  "category": {
    "description": "<string>",
    "heron_id": "<string>",
    "label": "<string>"
  },
  "num_annotations": 1,
  "transaction_heron_ids": [
    "<string>"
  ]
}