curl -X GET "https://secure.fusebill.com/v1/draftInvoices/pdf/{Id}?showTrackedItems=false" \
	-H "Content-Type: application/json" \
	-H "Authorization: Basic {APIKey}"

//query parameter
bool showTrackedItems = false;
int invoiceId = {Id};
//Setup API key
string apiKey = "{APIKey}";
//Configure URI
WebRequest request = WebRequest.Create("HTTPS://secure.fusebill.com/v1/draftInvoices/pdf/" + invoiceId + "?showTrackedItems=" + showTrackedItems);
//Add Content type
request.ContentType = "application/json";
//Add Api key authorization
request.Headers.Add(HttpRequestHeader.Authorization, "Basic " + apiKey);
//Set request method
request.Method = "GET";
//Perform the request
var httpResponse = (HttpWebResponse)request.GetResponse();
//Record the response from our request
var result = "";
using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
{
  result = streamReader.ReadToEnd();
}

#Import library Requests
import requests
#Pass in a dictionary to the Headers parameter
headers = {'Authorization' : 'Basic {APIKey}', 'Content-Type' : 'application/json'}
#Pass in your URI and Headers
r = requests.get('https://secure.fusebill.com/v1/draftInvoices/pdf/{Id}?showTrackedItems=false', headers=headers)

Upon success, a PDF file is returned. This is the same PDF which is emailed to customers from the Fusebill Administrative system.

{
    "ErrorId": 0,
    "HttpStatusCode": 404,
    "Errors": [
        {
            "Key": "Api Error",
            "Value": "DraftInvoice with id 1 not found."
        }
    ]
}