To use the ServiceNow REST API in code for authentication, ticket raising, and getting status back, you would typically follow these steps:

1. Authentication: Before you can interact with the ServiceNow API, you need authenticate. This generally involves providing a username and password, and possibly other security credentials.

   const sn = require('servicenow-rest-api');
   
   const ServiceNow = sn('INSTANCE', 'USERID', 'PASSWORD');
   
   ServiceNow.Authenticate().then(function(response){
     console.log(response.status); // Authentication status
   });

Replace 'INSTANCE', 'USERID', and 'PASSWORD' with your ServiceNow instance name and your credentials.

2. Raising a Ticket (Creating an Incident): Once authenticated, you can create a ticket (incident) by making a POST to the table API.

   // Define the data for the new incident
   const incidentData = {
     short_description: 'Short description of the issue',
     urgency: '1',     // 1 - High, 2 - Medium, 3 - Low
    : '1',      // 1 - High, 2 - Medium, 3 - Low
     description: 'Full description of the issue',
     // ... You can other fields as required
   };
   
   // Function to create a new incident
   ServiceNow.createNewTask('incident', incidentData, function(result){
     console.log(result); // Log the response which includes details of the created incident
   });

3. Getting the Status of a Ticket: To get the of a ticket, you can make a GET request, either to list all tickets or to retrieve a specific ticket by its sys_id.

   For a specific ticket:

   const sysId = 'YOUR_TICKET_SYS_ID'; // Replace with your ticket's sys_id
   
   // Function to get the data a specific incident using sys_id
   ServiceNow.getTableData('incident', sysId, function(result){
     console.log(result); // Log the status of the incident
   });

`

To retrieve all incidents:

Function to get data from the 'incident' table
ServiceNow.getTableData('incident', '',(result){
  console.log(result); // Log all the incidents
});

Notes:

• This code uses a Node.js wrapper library for the ServiceNow REST API. Make sure you have this library installed via npm:

  npm install servicenow-rest-api

• The actual field values and the of the incident data will depend on your ServiceNow configuration.
• This code is asynchronous, so you may need to use promises or async/await to handle the responses properly in a real-world application.
• The getTableData method generally requires additional parameters to filter and specify the result set you to retrieve; make sure you consult the ServiceNow API documentation for details on the query parameters you can use.

Here is an example of how you might use Python to work with the ServiceNow REST API for the tasks of authentication, ticket raising (creating an incident), and getting the status of the ticket. This example uses the requests library for HTTP requests, which you need to install using pip install requests if you haven't already.

Please replace your_instance, your_username, and your_password with your actual ServiceNow instance and credentials.

 requests
from requests.auth import HTTPBasicAuth

# Replace these variables with your ServiceNow instance and credentials
instance = 'your_instance'
user = 'your_username'
pwd = 'your_password'

# Set the request parameters
url = f'https://{instance}.service-now.com/api/now/table/incident'

# Set proper headers
headers = {
    "Content-Type": "application/json",
    "Accept": "application/json"
}

# Do the HTTP request for authentication
response = requests.get(url, auth=HTTPBasicAuth(user, pwd), headers=headers)

# Check for HTTP codes other than 200
if response.status_code != 200: 
    print('Status:', response.status_code, 'Headers:', response.headers, 'Error Response:', response.json())
    exit()

# Decode the JSON response into a dictionary and use the data
data = response.json()
print(data)

# Example payload for a new ticket
new_incident_data = {
    "short_description": "This is a test incident",
    "category": "software",
}

# Making a POST request to create a new incident
response = requests.post(url, auth=HTTPBasicAuth(user, pwd), headers=headers, json=new_incident_data)
if response.status_code != 201:
    print('Status:', response.status_code, 'Headers:', response.headers, 'Error Response:', response.json())
    exit()

# Decode the JSON response for the new incident
new_incident = response.json()
print(new_incident)
incident_sys_id = new_incident['result']['sys_id']

# Getting the status of the created incident using its sys_id
status_url = f'https://{instance}.service-now.com/api/now/table/incident/{incident_sys_id}'
response = requests.get(status_url, auth=HTTPBasicAuth(user, pwd), headers=headers)
if response.status_code != 200:
    print('Status:', response.status_code, 'Headers:', response.headers, 'Error Response:', response.json())
    exit()

incident_status = response.json()
print(incident_status)

This script does the following:

1. Authenticates with the ServiceNow API using HTTP Basic Authentication.
2. Retrieves data (which can be used to check if the authentication is successful).
3. Creates a new incident with short_description and category. You would need to modify this payload based on what fields are mandatory and used in your ServiceNow environment.
4. Fetches the status of the newly created incident by its sys_id.

Make sure your account has the necessary permissions to perform these actions, and for production code, ensure you handle exceptions and errors appropriately.