func (c *ContactService) FindByID(id string) (Contact, error) {
	return c.findWithIdentifiers(UserIdentifiers{ID: id})
}
FindByID looks up a Contact by their Intercom ID.
package intercom
import "fmt"
type ContactService struct {
	Repository ContactRepository
}
type ContactList struct {
	Pages    PageParams
	Contacts []Contact
}
type Contact struct {
	ID                     string                 `json:"id,omitempty"`
	Email                  string                 `json:"email,omitempty"`
	UserID                 string                 `json:"user_id,omitempty"`
	Name                   string                 `json:"name,omitempty"`
	Avatar                 *UserAvatar            `json:"avatar,omitempty"`
	LocationData           *LocationData          `json:"location_data,omitempty"`
	LastRequestAt          int64                  `json:"last_request_at,omitempty"`
	CreatedAt              int64                  `json:"created_at,omitempty"`
	UpdatedAt              int64                  `json:"updated_at,omitempty"`
	SessionCount           int64                  `json:"session_count,omitempty"`
	LastSeenIP             string                 `json:"last_seen_ip,omitempty"`
	SocialProfiles         *SocialProfileList     `json:"social_profiles,omitempty"`
	UnsubscribedFromEmails *bool                  `json:"unsubscribed_from_emails,omitempty"`
	UserAgentData          string                 `json:"user_agent_data,omitempty"`
	Tags                   *TagList               `json:"tags,omitempty"`
	Segments               *SegmentList           `json:"segments,omitempty"`
	Companies              *CompanyList           `json:"companies,omitempty"`
	CustomAttributes       map[string]interface{} `json:"custom_attributes,omitempty"`
	UpdateLastRequestAt    *bool                  `json:"update_last_request_at,omitempty"`
	NewSession             *bool                  `json:"new_session,omitempty"`
}
type contactListParams struct {
	PageParams
	SegmentID string `url:"segment_id,omitempty"`
	TagID     string `url:"tag_id,omitempty"`
	Email     string `url:"email,omitempty"`
}