curl -H "Authorization: Basic BASE64_ENCODED_PUBLIC_KEY_AND_PRIVATE_KEY" -X PUT "trackdrive.com/api/v1/contacts/18551231234?blocked=true"
| Param name | 
           
              Description
             
            
                Validations
               
             | 
      
|---|---|
| 
        id  Optional  | 
      
         Lookup a contact by internal id, or by the 10+ digit telephone number. For example: Validations: 
  | 
    
| 
        opt_out  Optional  | 
      
         Mark a contact as opt-out or opt-in. Opt-out prevents outbound actions (calls, sms, emails), but allows the lead to dial in to your offers to resubscribe. Validations: 
  | 
    
| 
        blocked  Optional  | 
      
         Block or unblock a contact. Block prevents outbound actions (calls, sms, emails), and also blocks all inbound calls & sms. Validations: 
  |