curl --request POST \
  --url https://pandabase.io/api/products/{productId}/licenses \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'X-Storefront-Id: <x-storefront-id>' \
  --data '{
  "customer_id": "cust_123456",
  "key": "CUSTOM-KEY-HERE",
  "metadata": {},
  "expires_at": "2023-11-07T05:31:56Z"
}'

{
  "ok": true,
  "data": {
    "id": "lic_abc123",
    "key": "XXXX-XXXX-XXXX-XXXX",
    "product_id": "prod_xyz789",
    "status": "active",
    "customer_id": "cust_123456",
    "metadata": {},
    "expires_at": "2025-12-31T23:59:59Z",
    "activated_at": "2023-11-07T05:31:56Z",
    "created_at": "2023-11-07T05:31:56Z"
  }
}