# Retrieve invoice

Retrieve a specific invoice by ID. Non-staff users can only access their organization's invoices.

#### Path Parameters

**`invoice_id`** string required

Invoice ID (format: `inv_<uuid>`).

## Returns

Returns the complete invoice object including all line items, tax calculations, and metadata.


```bash
curl "https://api.aitronos.com/v1/invoices/inv_123e4567e89b12d3a456426614174000" \
  -H "X-API-Key: $FREDDY_API_KEY"
```


```python
import os
import requests

api_key = os.environ["FREDDY_API_KEY"]
invoice_id = "inv_123e4567e89b12d3a456426614174000"

response = requests.get(
    f"https://api.aitronos.com/v1/invoices/{invoice_id}",
    headers={"X-API-Key": api_key}
)

invoice = response.json()
print(f"Invoice: {invoice['invoice_number']}")
print(f"Total: CHF {invoice['total_amount']}")
print(f"Status: {invoice['status']}")
```


```javascript
const invoiceId = "inv_123e4567e89b12d3a456426614174000";

const response = await fetch(
  `https://api.aitronos.com/v1/invoices/${invoiceId}`,
  {
    headers: {
      "X-API-Key": process.env.FREDDY_API_KEY
    }
  }
);

const invoice = await response.json();
console.log(`Invoice: ${invoice.invoice_number}`);
console.log(`Total: CHF ${invoice.total_amount}`);
console.log(`Status: ${invoice.status}`);
```

**Response:**

200 OK

```json
{
  "id": "inv_123e4567e89b12d3a456426614174000",
  "invoice_number": "INV-2024-12-AIT-001",
  "organization_id": "org_123e4567e89b12d3a456426614174000",
  "organization_name": "Aitronos AG",
  "billing_period_start": "2024-12-01T00:00:00Z",
  "billing_period_end": "2025-01-01T00:00:00Z",
  "issue_date": "2024-12-31T23:59:59Z",
  "due_date": "2025-01-30T23:59:59Z",
  "payment_date": null,
  "currency": "CHF",
  "exchange_rate": 1.0,
  "subtotal": 1250.50,
  "tax_rate": 0.081,
  "tax_amount": 101.29,
  "total_amount": 1351.79,
  "status": "issued",
  "items": [
    {
      "id": "invitem_123e4567e89b12d3a456426614174000",
      "description": "GPT-4 Turbo - Input Tokens",
      "model_name": "gpt-4-turbo",
      "provider": "openai",
      "quantity": 1250.5,
      "unit": "1K tokens",
      "unit_price": 0.01,
      "amount": 12.51,
      "input_tokens": 1250500,
      "output_tokens": null,
      "total_requests": 1523
    }
  ],
  "created_at": "2024-12-31T23:59:59Z",
  "updated_at": "2024-12-31T23:59:59Z"
}
```

401 Unauthorized

```json
{
  "success": false,
  "error": {
    "code": "AUTHENTICATION_REQUIRED",
    "message": "Authentication required",
    "system_message": "Missing or invalid authentication token",
    "type": "client_error",
    "status": 401,
    "details": {},
    "trace_id": "2fbbf3b6-51a1-4f1b-88e2-c00e8b52fbb8",
    "timestamp": "2025-11-26T08:21:45Z"
  }
}
```

403 Forbidden

```json
{
  "success": false,
  "error": {
    "code": "ORGANIZATION_ACCESS_DENIED",
    "message": "You don't have permission to access this invoice",
    "system_message": "User cannot access this organization's invoices",
    "type": "client_error",
    "status": 403,
    "details": {
      "invoice_id": "inv_123e4567e89b12d3a456426614174000"
    },
    "trace_id": "2fbbf3b6-51a1-4f1b-88e2-c00e8b52fbb8",
    "timestamp": "2025-11-26T08:21:45Z"
  }
}
```

404 Not Found

```json
{
  "success": false,
  "error": {
    "code": "INVOICE_NOT_FOUND",
    "message": "Invoice not found",
    "system_message": "Invoice does not exist",
    "type": "client_error",
    "status": 404,
    "details": {
      "invoice_id": "inv_123e4567e89b12d3a456426614174000"
    },
    "trace_id": "2fbbf3b6-51a1-4f1b-88e2-c00e8b52fbb8",
    "timestamp": "2025-11-26T08:21:45Z"
  }
}
```