const options = {
  method: 'PATCH',
  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>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    invoiceCode: '<string>',
    customerContact: {
      id: '<string>',
      object: 'resourceRef',
      model: '<string>',
      fields: '<unknown>',
      rawResource: '<unknown>',
      remote: {id: '<string>'},
      createdAt: '<string>',
      updatedAt: '<string>'
    },
    customerCompany: {
      id: '<string>',
      object: 'resourceRef',
      model: '<string>',
      fields: '<unknown>',
      rawResource: '<unknown>',
      remote: {id: '<string>'},
      createdAt: '<string>',
      updatedAt: '<string>'
    },
    issuedAt: '<string>',
    dueAt: '<string>',
    paidAt: '<string>',
    status: 'draft',
    lineItems: [
      {
        id: '<string>',
        object: 'resourceRef',
        model: '<string>',
        fields: '<unknown>',
        rawResource: '<unknown>',
        remote: {id: '<string>'},
        createdAt: '<string>',
        updatedAt: '<string>'
      }
    ],
    currency: '<string>',
    preTaxAmount: 1,
    taxAmount: 1,
    totalAmount: 1,
    inclusiveOfTax: true,
    balance: 1,
    note: '<string>'
  })
};

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>",
  "remote": {
    "id": "<string>"
  }
}