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({
    name: '<string>',
    amount: 1,
    currency: '<string>',
    contacts: [
      {
        id: '<string>',
        model: '<string>',
        fields: null,
        rawResource: null,
        remote: {id: '<string>'},
        createdAt: '<string>',
        updatedAt: '<string>'
      }
    ],
    companies: [
      {
        id: '<string>',
        model: '<string>',
        fields: null,
        rawResource: null,
        remote: {id: '<string>'},
        createdAt: '<string>',
        updatedAt: '<string>'
      }
    ],
    engagements: [
      {
        id: '<string>',
        model: '<string>',
        fields: null,
        rawResource: null,
        remote: {id: '<string>'},
        createdAt: '<string>',
        updatedAt: '<string>'
      }
    ]
  })
};

fetch('https://api.runmorph.dev/v1/resources/crmOpportunity/{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>"
  }
}