# Generate invoice

Generate an invoice for a specific organization and billing period. This endpoint is restricted to staff users only.

#### Request Body

**`organization_id`** string required

Organization ID (format: `org_<uuid>`).

**`year`** integer required

Year for billing period (2024-2100).

**`month`** integer required

Month for billing period (1-12).

**`currency`** string optional

Currency code (CHF, USD, EUR, GBP). Defaults to CHF.

**`regenerate`** boolean optional

Regenerate if invoice already exists. Defaults to false.

## Returns

Returns the generated invoice object with all line items, tax calculations, and metadata.


```bash
curl -X POST "https://api.aitronos.com/v1/invoices/generate" \
  -H "X-API-Key: $FREDDY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "organization_id": "org_123e4567e89b12d3a456426614174000",
    "year": 2024,
    "month": 12,
    "currency": "CHF",
    "regenerate": false
  }'
```


```python
import os
import requests

api_key = os.environ["FREDDY_API_KEY"]

response = requests.post(
    "https://api.aitronos.com/v1/invoices/generate",
    headers={"X-API-Key": api_key},
    json={
        "organization_id": "org_123e4567e89b12d3a456426614174000",
        "year": 2024,
        "month": 12,
        "currency": "CHF",
        "regenerate": False
    }
)

invoice = response.json()
print(f"Invoice generated: {invoice['invoice_number']}")
```


```javascript
const response = await fetch(
  "https://api.aitronos.com/v1/invoices/generate",
  {
    method: "POST",
    headers: {
      "X-API-Key": process.env.FREDDY_API_KEY,
      "Content-Type": "application/json"
    },
    body: JSON.stringify({
      organization_id: "org_123e4567e89b12d3a456426614174000",
      year: 2024,
      month: 12,
      currency: "CHF",
      regenerate: false
    })
  }
);

const invoice = await response.json();
console.log(`Invoice generated: ${invoice.invoice_number}`);
```

**Response:**

201 Created

```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
    },
    {
      "id": "invitem_456e4567e89b12d3a456426614174000",
      "description": "GPT-4 Turbo - Output Tokens",
      "model_name": "gpt-4-turbo",
      "provider": "openai",
      "quantity": 3420.75,
      "unit": "1K tokens",
      "unit_price": 0.03,
      "amount": 102.62,
      "input_tokens": null,
      "output_tokens": 3420750,
      "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": "INSUFFICIENT_PERMISSIONS",
    "message": "You don't have permission to perform this action.",
    "system_message": "Only staff can create invoices",
    "type": "client_error",
    "status": 403,
    "details": {
      "required_role": "aitronos_staff"
    },
    "trace_id": "2fbbf3b6-51a1-4f1b-88e2-c00e8b52fbb8",
    "timestamp": "2025-11-26T08:21:45Z"
  }
}
```

404 Not Found

```json
{
  "success": false,
  "error": {
    "code": "ORGANIZATION_NOT_FOUND",
    "message": "Organization not found",
    "system_message": "Organization does not exist",
    "type": "client_error",
    "status": 404,
    "details": {
      "organization_id": "org_123e4567e89b12d3a456426614174000"
    },
    "trace_id": "2fbbf3b6-51a1-4f1b-88e2-c00e8b52fbb8",
    "timestamp": "2025-11-26T08:21:45Z"
  }
}
```

409 Conflict

```json
{
  "success": false,
  "error": {
    "code": "RESOURCE_ALREADY_EXISTS",
    "message": "Invoice already exists for this period",
    "system_message": "Use regenerate=true to recreate",
    "type": "client_error",
    "status": 409,
    "details": {
      "organization_id": "org_123e4567e89b12d3a456426614174000",
      "year": 2024,
      "month": 12
    },
    "trace_id": "2fbbf3b6-51a1-4f1b-88e2-c00e8b52fbb8",
    "timestamp": "2025-11-26T08:21:45Z"
  }
}
```

422 Unprocessable Entity

```json
{
  "success": false,
  "error": {
    "code": "INVALID_INPUT",
    "message": "No usage data found for period",
    "system_message": "Cannot generate invoice without usage data",
    "type": "client_error",
    "status": 422,
    "details": {
      "organization_id": "org_123e4567e89b12d3a456426614174000",
      "year": 2024,
      "month": 12
    },
    "trace_id": "2fbbf3b6-51a1-4f1b-88e2-c00e8b52fbb8",
    "timestamp": "2025-11-26T08:21:45Z"
  }
}
```