curl --request POST \
  --url https://api.meetcampfire.com/coa/api/transaction/merge \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "transaction_ids": [
    12345,
    67890
  ]
}
'

{
  "id": 123,
  "is_deleted": false,
  "deleted_at": "2023-11-07T05:31:56Z",
  "transactions": [
    {
      "id": 123,
      "is_deleted": false,
      "deleted_at": "2023-11-07T05:31:56Z",
      "entity_name": "<string>",
      "entity_currency": "<string>",
      "account_name": "<string>",
      "account_number": "<string>",
      "vendor_name": "<string>",
      "vendor_id": "<string>",
      "department_name": "<string>",
      "department_code": "<string>",
      "parent_department_name": "<string>",
      "parent_department": 123,
      "tags": [
        {
          "id": 123,
          "group_name": "<string>",
          "parent_name": "<string>",
          "is_deleted": false,
          "deleted_at": "2023-11-07T05:31:56Z",
          "name": "<string>",
          "created_at": "2023-11-07T05:31:56Z",
          "last_modified_at": "2023-11-07T05:31:56Z",
          "customer": 123,
          "parent": 123,
          "is_active": true,
          "group": 123
        }
      ],
      "journal": 123,
      "journal_order": "<string>",
      "journal_memo": "<string>",
      "journal_type": "<string>",
      "intercompany_journal": 123,
      "created_automatically": true,
      "journal_attachments": [
        {
          "id": 123,
          "customer": 123,
          "created_at": "2023-11-07T05:31:56Z",
          "created_by": 123,
          "created_by_name": "<string>",
          "created_by_email": "<string>",
          "last_modified_at": "2023-11-07T05:31:56Z",
          "name": "<string>",
          "url": "<string>",
          "s3_path": "<string>",
          "app": "<string>",
          "model": "<string>",
          "is_deleted": false,
          "deleted_at": "2023-11-07T05:31:56Z",
          "s3_content_type": "<string>",
          "s3_content_length": 1073741823,
          "object_id": 1073741823
        }
      ],
      "journal_type_name": "<string>",
      "invoice": "<string>",
      "bill": "<string>",
      "date_month": "<string>",
      "date_year": "<string>",
      "balance_after_transaction": 123,
      "bank_account": "<string>",
      "bank_account_name": "<string>",
      "last_modified_by_name": "<string>",
      "account_type": "<string>",
      "account_subtype": "<string>",
      "parent_account_name": "<string>",
      "files": "<string>",
      "invoice_id": 123,
      "invoice_number": "<string>",
      "bill_id": 123,
      "bill_number": "<string>",
      "file_names": "<string>",
      "has_matches": true,
      "has_ai": true,
      "has_rules": true,
      "has_merges": true,
      "has_fixed_asset_rule_matches": true,
      "primary_action_type": "<string>",
      "suggested_account": 123,
      "suggested_account_name": "<string>",
      "suggested_account_number": "<string>",
      "amount": 0,
      "amount_native": 0,
      "amount_book": 0,
      "amortization_schedule": [
        {
          "journal_entry_order": "<string>",
          "date": "2023-12-25",
          "amount": 0,
          "customer": 123,
          "id": 123,
          "posted": true,
          "transaction": 123,
          "bill_line": 123,
          "journal_entry": 123
        }
      ],
      "linked_amortizations": [
        {}
      ],
      "created_fixed_assets": [
        {}
      ],
      "reconciliation_report": "<string>",
      "opposing_account_name": "<string>",
      "opposing_account_number": "<string>",
      "transaction_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "balance_before_transaction": 0,
      "created_at": "2023-11-07T05:31:56Z",
      "last_modified_at": "2023-11-07T05:31:56Z",
      "customer": 123,
      "entity": 123,
      "account": 123,
      "debit_amount": 0,
      "credit_amount": 0,
      "debit_amount_book": 0,
      "credit_amount_book": 0,
      "debit_amount_native": 0,
      "credit_amount_native": 0,
      "currency": "<string>",
      "exchange_rate": 0,
      "exchange_rate_book": 0,
      "posted_at": "2023-12-25",
      "merchant_name": "<string>",
      "bank_description": "<string>",
      "tag_ids": [
        0
      ],
      "tag_group_ids": [
        0
      ],
      "note": "<string>",
      "receipt_url": "<string>",
      "external_id": "<string>",
      "needs_review": true,
      "draft_matches": null,
      "last_lam_prediction_attempt": "2023-11-07T05:31:56Z",
      "source_entity": 123,
      "parent_bank_transaction": 123,
      "vendor": 123,
      "department": 123,
      "last_modified_by": 123
    }
  ],
  "attachments": [
    {
      "id": 123,
      "customer": 123,
      "created_at": "2023-11-07T05:31:56Z",
      "created_by": 123,
      "created_by_name": "<string>",
      "created_by_email": "<string>",
      "last_modified_at": "2023-11-07T05:31:56Z",
      "name": "<string>",
      "url": "<string>",
      "s3_path": "<string>",
      "app": "<string>",
      "model": "<string>",
      "is_deleted": false,
      "deleted_at": "2023-11-07T05:31:56Z",
      "s3_content_type": "<string>",
      "s3_content_length": 1073741823,
      "object_id": 1073741823
    }
  ],
  "invoice": 123,
  "reversal_of_order": "<string>",
  "reversals": [
    {}
  ],
  "entity_name": "<string>",
  "entity_currency": "<string>",
  "credit_memos": [
    {}
  ],
  "debit_memos": [
    {}
  ],
  "ramp_use_sandbox": "<string>",
  "search_vector": "<string>",
  "search_text": "<string>",
  "created_at": "2023-11-07T05:31:56Z",
  "last_modified_at": "2023-11-07T05:31:56Z",
  "customer": 123,
  "order": "<string>",
  "close_task_id": "<string>",
  "journal_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "memo": "<string>",
  "currency": "<string>",
  "exchange_rate": 0,
  "exchange_rate_book": 0,
  "use_average_rate": true,
  "created_automatically": true,
  "date": "2023-12-25",
  "ref_number": "<string>",
  "source": "<string>",
  "source_id": "<string>",
  "recurrent_journal_entry": 123,
  "entity": 123,
  "reversal_of": 123,
  "intercompany_journal": 123,
  "source_file": 123,
  "chat": 123
}