What to do

Add a document of how to add new domain in the client

Background

When adding a new domain in client like below, gohubspot_test.go needs to be updated in unique way otherwise the tests will fail.

type Client struct {
       ...

	CRM       *CRM
	Marketing *Marketing // <- this
}

Acceptance criteria

Make how to add a domain clear.

Is your feature request related to a problem? Please describe.
At the moment if I want to update a contact I would need to know the contact hubspot ID where I would just like to use the contact email.

Describe the solution you'd like
Either improve on the current function to facilitate either option or an additional function to allow for this.

Version

• Go 1.17
• go-hubspot v0.1.0

Describe the bug

If the HubSpot field does not have a value, the struct will be marshalled with nil.
But, the HsStr.String is a method of value type, a call with nil will fail and a panic will be occurred.
We need to make the receiver a pointer and do a nil check.

Is your feature request related to a problem? Please describe.
HubSpot added private apps (scoped api key) auth.
go-hubspot needs to support this as well.
https://developers.hubspot.com/docs/api/private-apps

Sample of the api call using private apps from HubSpot.

axios.get('https://api.hubapi.com/crm/v3/objects/contacts',
  {
    headers: {
      'Authorization': `Bearer ${YOUR_TOKEN}`,
      'Content-Type': 'application/json'
    }
  },
  (err, data) => {
    // Handle the API response
  }
);

Describe the solution you'd like
As with API key and OAuth, we should be able to pass private apps token to the client in the form of an Option.

Describe alternatives you've considered

Additional context
On another note, APIKey will be discontinued on November 30 2022.
https://developers.hubspot.com/changelog/upcoming-api-key-sunset