how to write a server script to update the credit score of a contact?

Consider a company CreditX is a leading financial services company specializing in providing credit solutions. They assess creditworthiness accurately, ensuring fair lending practices. They provide services like personal loans and credit cards.
To manage their sales and support they use CRM. Their customers are created as Contacts in CRM. To provide a better offer to customers they need the credit scores of their customers.
This can be done easily with Server Scripts and Jobs. To do this, you must create a Process or Workflow and add a Server Script action.
 
Explanation

• When a record is saved, this action will trigger.
• Getting tax identification number from record data (custom field)
• If TIN is there, send a GET API request to the credit score provider service with TIN in the query string.
• On request, the basic authentication header is set for authorization.
• If the API request is successful, get the credit score from the response.
• Set the credit score to the field.
• Return record data back.
• Since the credit score field value is changed, workflow or process will update it to the record.