Good afternoon, 

I have a API call class that is working as I need it to, however I am not trying to get the class to execute every night at 2 AM. I am trying to implement a schedulable class to call the API class and make it execute every night, but am a little unsure how to do this.. 

Here is my REST API class
 

string url = *****;
Integer int1 = 0;

String myProcedure1() {
    Http http = new Http();
    HttpRequest request = new HttpRequest();
    request.setHeader('Authorization', 'Bearer ****);
    request.setEndpoint(url);
	request.setMethod('GET');
    HttpResponse response = http.send(request);
    // If the request is successful, parse the JSON response.
    if (response.getStatusCode() == 200) {
        // Deserializes the JSON string into collections of posts.
        Map<String,Object> wrapper = (Map<String,Object>) JSON.deserializeUntyped(response.getBody());
        if (wrapper.containsKey('data')) {
            Map<String, Object> wrapper2 = (Map<String,Object>) wrapper.get('data');
            if(wrapper2.containsKey('data')) {
                List<Object> people = (List<Object>)wrapper2.get('data');
                for (Object peopleWrapper : people) {
                    Map<String,Object> Employees = (Map<String,Object>) peopleWrapper;
                    if(Employees.containsKey('last_name')){
                    String ZenefitsLastName = (String) Employees.get('last_name');
                    String ZenefitsFirstName = (String) Employees.get('first_name');
                    String ZenefitseEmployeeId = (String) Employees.get('id');
                    String ZenefitsEmail = (String) Employees.get('work_email');    
                        
                    List<Contact> contactList = [SELECT Id, FirstName, LastName, Zenefits_ID__c, Email FROM Contact WHERE Email = :ZenefitsEmail LIMIT 200];
                            List<Contact> contactsToUpdate = new List<Contact>();
                        	for(Contact con : contactList){
                       		con.Zenefits_Id__c = ZenefitseEmployeeId;
                            contactsToUpdate.add(con);
                        
                        }
                        update contactsToUpdate;
                            
                        
                        
					//we now need to find all contacts in SF that match the contacts in Employees
                    //once we have matches we need to synce each ID 
                   
                        
         
                            system.debug('Employees ' + Employees);
                            system.debug('last name ' + ZenefitsLastName);
                        	system.debug('Employee id ' + ZenefitseEmployeeId);
                        	system.debug('first name ' + ZenefitsFirstName);
                            system.debug('Contact list ' + contactList);
                            system.debug('TEST ' + contactsToUpdate);
                   			}
               			}
            		}
            
            return null;
        }
        return null;
    }
    return null;
}

void myProcedure2() {
    while (url != null) {
        System.debug('BEFORE URL: ' + url);
        url = myProcedure1();
        System.debug('AFTER URL: ' + url);
    }
}

myProcedure2();

I have gone ahead and taken out the URL and the Bearer headers for privacy purposes, but all else is there. 

For anyone that has implemented a way to have an API call excecute every night on a daily basis please share your wisdome with me !! 

Thanks in advance !!