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const response = await fetch(
  'https://www.arnproxy.com/account/api/v1/catalog?product_id=' + productId,
  { headers: { Authorization: 'Bearer ' + apiKey } }
);
const catalog = await response.json();
if (!response.ok || !catalog.ok) throw new Error('Catalog request failed');
const purposeGroup = catalog.data.purposes.find(group => group.id === 201);
if (!purposeGroup) throw new Error('Purpose group 201 is not available');
const purposeOptions = purposeGroup.children.map(({ id, name }) => ({ id, name }));
// Show only purposeOptions. The customer selects selectedSubpurposeId.
const purchaseLine = {
  location_id: selectedLocationId,
  time_id: selectedTimeId,
  quantity: selectedQuantity,
  purpose_id: 201,
  subpurpose_id: selectedSubpurposeId
};
// Add other_purpose (1–30 characters) only when selectedSubpurposeId === -1.
// No purchase is sent by this example.

import json
import urllib.request

request = urllib.request.Request(
    'https://www.arnproxy.com/account/api/v1/catalog?product_id=' + str(product_id),
    headers={'Authorization': 'Bearer ' + api_key}
)
with urllib.request.urlopen(request, timeout=20) as response:
    catalog = json.load(response)
if not catalog.get('ok'):
    raise RuntimeError('Catalog request failed')
purpose_group = next((g for g in catalog['data']['purposes'] if g['id'] == 201), None)
if purpose_group is None:
    raise RuntimeError('Purpose group 201 is not available')
purpose_options = [{'id': p['id'], 'name': p['name']} for p in purpose_group['children']]
# Display only purpose_options; the customer selects selected_subpurpose_id.
purchase_line = {
    'location_id': selected_location_id,
    'time_id': selected_time_id,
    'quantity': selected_quantity,
    'purpose_id': 201,
    'subpurpose_id': selected_subpurpose_id,
}
# For Other (-1), also set other_purpose to 1–30 characters.
# This example does not submit a purchase.

{
    "ok": true,
    "data": {
        "product": {
            "id": 5,
            "name": "IPv4 Proxy",
            "minimum_quantity": 1
        },
        "currency": "TRY",
        "locations": [
            {
                "id": 10,
                "name": "Example country",
                "periods": [
                    {
                        "id": 101,
                        "name": "7 days",
                        "days": 7,
                        "base_unit_price": "10.0000"
                    }
                ]
            }
        ],
        "purposes": [
            {
                "id": 201,
                "name": "Purpose",
                "children": [
                    {
                        "id": 202,
                        "name": "Example purpose"
                    }
                ]
            }
        ],
        "discount_scope": "country",
        "stock_checked": false,
        "purchase_available": true
    },
    "meta": {
        "request_id": "000000000000000000000001",
        "phase": "public_v1",
        "source": "arnproxy_records"
    }
}

{
  "ok": false,
  "error": { "code": "INVALID_API_KEY" },
  "meta": { "request_id": "000000000000000000000001" }
}