get https://interseller.io/api/contacts/
| Key | Description | 
|---|---|
| state | Shows the current state the contact is in. This state will change based on the calculation of other fields on the contact. | 
| replied_at | The date that this contact first responded back. If this value is empty, the contact has not yet replied. | 
| first_messaged_at | The date which we first messaged the contact through this sequence. If the value is empty, the contact has not yet been messaged. | 
| booked_at | The date which the contact booked a calendar event with the user. | 
| viewed_at | The date which the contact first opened any email | 
| visited_at | The date which the contact first clicked any link in any email | 
| unsubscribed | Has this contact unsubscribed from the sequence | 
| bounced | Did the email address bounce back |