DELETE

@HttpDelete
    global static string deleteContact() {
        // Retrieving the incoming REST request
        RestRequest req = RestContext.request;
        
        // Extracting the contact Id from the request URI
        String contactId = req.requestURI.substring(req.requestURI.lastindexof('/') + 1);
        
        // Querying for the contact record to be deleted
        Contact contact = [SELECT Id FROM Contact WHERE id = :contactId LIMIT 1];
        
        // Deleting the contact record
        delete contact;
        
        // Returning a success message
        return 'Success Deletion';
    }