const options = {method: 'POST'};

fetch('https://api.dolfinai.co/purchase-orders/{id}/close', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "poNumber": "<string>",
  "currency": "<string>",
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "organisationId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "supplierId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "externalRef": "<string>",
  "orderDate": "2023-11-07T05:31:56Z",
  "expectedDeliveryDate": "2023-11-07T05:31:56Z",
  "lines": [
    {
      "description": "<string>",
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "sku": "<string>",
      "quantityOrdered": 123,
      "unit": "<string>",
      "unitPrice": 123,
      "taxRate": 123,
      "taxAmount": 123,
      "subTotal": 123,
      "sortOrder": 123,
      "matchedQuantity": 123,
      "fullyMatched": true
    }
  ],
  "createdAt": "2023-11-07T05:31:56Z",
  "updatedAt": "2023-11-07T05:31:56Z"
}