const options = {
  method: 'GET',
  headers: {
    'x-api-key': '<api-key>',
    'x-api-secret': '<api-key>',
    'x-connector-id': '<api-key>',
    'x-owner-id': '<api-key>',
    'x-session-token': '<api-key>'
  }
};

fetch('https://api.runmorph.dev/v1/resources/accountingInvoice/{resourceId}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "object": "resource",
  "model": "<string>",
  "id": "<string>",
  "fields": {
    "invoiceCode": "<string>",
    "currency": "<string>",
    "preTaxAmount": 1,
    "taxAmount": 1,
    "totalAmount": 1,
    "inclusiveOfTax": true,
    "balance": 1,
    "customerContact": {
      "id": "<string>",
      "model": "<string>",
      "fields": null,
      "rawResource": null,
      "remote": {
        "id": "<string>"
      },
      "createdAt": "<string>",
      "updatedAt": "<string>"
    },
    "customerCompany": {
      "id": "<string>",
      "model": "<string>",
      "fields": null,
      "rawResource": null,
      "remote": {
        "id": "<string>"
      },
      "createdAt": "<string>",
      "updatedAt": "<string>"
    },
    "issuedAt": "<string>",
    "dueAt": "<string>",
    "paidAt": "<string>",
    "lineItems": [
      {
        "id": "<string>",
        "model": "<string>",
        "fields": null,
        "rawResource": null,
        "remote": {
          "id": "<string>"
        },
        "createdAt": "<string>",
        "updatedAt": "<string>"
      }
    ],
    "note": "<string>"
  },
  "createdAt": "<string>",
  "updatedAt": "<string>",
  "remote": {
    "id": "<string>"
  },
  "rawResource": null,
  "warnings": [
    {
      "code": "<string>",
      "message": "<string>"
    }
  ]
}