curl --request GET \
  --url https://app.herondata.io/api/end_users/{end_user_id_or_heron_id}/transactions \
  --header 'x-api-key: <api-key>'

{
  "_meta": {
    "next_url": "<string>",
    "num_results": 123,
    "page": 123,
    "per_page": 123,
    "prev_url": "<string>"
  },
  "transactions_enriched": [
    {
      "amount": -42.42,
      "description": "GOOGLE *ADS12340929 [email protected] US",
      "account_id": "checking_account_202348",
      "account_number": "1234567890",
      "annotation": {
        "annotator": {
          "context": "sync",
          "priority_type": "gold_standard"
        },
        "category": {
          "label": "Rent",
          "heron_id": "ctg_APCVGT9SNofLxix94LeBPh"
        },
        "confidence": 123,
        "model_version": "<string>"
      },
      "balance": 423,
      "counterparty": "GOOGLE",
      "currency": "USD",
      "data_source_account_heron_id": "dsa_fbuF95zT2sTmqbP4ZeCZRX",
      "data_source_heron_id": "dso_is39MKJXv6xHW6iqk8GA5y",
      "end_user_id": "my_best_customer_203948",
      "features": {
        "description_clean": "GOOGLE ADS",
        "duplicate_of_id": "txn_Fr5U34CvXFp5toXHt4Kkfn",
        "has_matching_transaction": true,
        "is_potential_duplicate": true,
        "is_recurring": true
      },
      "heron_id": "txn_jPEzNLr8B8dqji7wc3Kpzh",
      "last_updated": "2026-01-22T15:29:57.341448",
      "merchant": {
        "name": "<string>",
        "url": "<string>",
        "categories": [
          {
            "code": "7311",
            "description": "Advertising services",
            "slug": "advertising_services"
          }
        ],
        "group_id": "Uber",
        "heron_id": "mrc_hxWgSHmwGxzGcHsxUzxfYS",
        "icon_url": "<string>",
        "is_priority": true,
        "logo_url": "<string>"
      },
      "reference_id": "my_favourite_transaction_231098",
      "request_id": "req_6mQPtQsRfmDSeGS5vvAg8z",
      "timestamp": "2021-11-12T10:38:05Z",
      "transaction_code": "card"
    }
  ]
}