const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    customerId: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    currency: '<string>',
    lineItems: [
      {
        id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
        productId: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
        quantity: 123,
        taxRateId: '3c90c3cc-0d44-4b50-8888-8dd25736052a'
      }
    ]
  })
};

fetch('https://api.dolfinai.co/invoices', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "currency": "<string>",
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "organisationId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "customerId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "documentNumber": "<string>",
  "issueDate": "2023-11-07T05:31:56Z",
  "dueDate": "2023-11-07T05:31:56Z",
  "subTotal": 123,
  "taxAmount": 123,
  "totalAmount": 123,
  "memo": "<string>",
  "createdAt": "2023-11-07T05:31:56Z",
  "createdBy": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "updatedAt": "2023-11-07T05:31:56Z",
  "updatedBy": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "paymentUrl": "<string>",
  "customer": {
    "name": "<string>",
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "organisationId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "email": "<string>",
    "phone": "<string>",
    "taxNumber": "<string>",
    "addressLine1": "<string>",
    "addressLine2": "<string>",
    "city": "<string>",
    "state": "<string>",
    "postalCode": "<string>",
    "country": "<string>",
    "createdAt": "2023-11-07T05:31:56Z",
    "createdBy": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "updatedAt": "2023-11-07T05:31:56Z",
    "updatedBy": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  },
  "lineItems": [
    {
      "description": "<string>",
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "productId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "quantity": 123,
      "unitPrice": 123,
      "taxAmount": 123,
      "subTotal": 123
    }
  ]
}