curl -X POST https://signia.kore.pe/api/v1/documents/send \
  -H "Authorization: Bearer TU_TOKEN_API" \
  -H "Content-Type: application/json" \
  -d '{
    "company": {
      "ruc": "20123456789"
    },
    "document": {
      "document_type_id": "01",
      "series": "F001",
      "number": "1",
      "currency_type_id": "PEN"
    },
    "items": [
      {
        "quantity": 1,
        "unit_price": 118.00,
        "description": "Desarrollo Software"
      }
    ]
  }'

$client = new \GuzzleHttp\Client();
$response = $client->post('https://signia.kore.pe/api/v1/documents/send', [
    'headers' => [
        'Authorization' => 'Bearer TU_TOKEN_API',
        'Accept'        => 'application/json',
    ],
    'json' => [
        'company' => ['ruc' => '20123456789'],
        'document' => ['series' => 'F001', 'number' => '1'],
        'items' => [...]
    ]
]);

echo $response->getBody();

fetch('https://signia.kore.pe/api/v1/documents/send', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer TU_TOKEN_API',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    company: { ruc: "20123456789" },
    document: { series: "F001", number: "1" },
    items: [...]
  })
})
.then(res => res.json())
.then(console.log);