---
title: "Invoice Parameters"
slug: "invoice-parameters"
updated: 2020-04-16T20:32:00Z
published: 2020-04-16T20:32:00Z
canonical: "onpremises.webtrends.help/invoice-parameters"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://onpremises.webtrends.help/llms.txt
> Use this file to discover all available pages before exploring further.

# Invoice Parameters

Use `WT.tx_i`, `WT.tx_id`, and `WT.tx_it` parameters together. You must enable Visitor History in order to use the Invoice parameters.

#### WT.tx_i

`WT.tx_i=InvoiceNumber` Identifies the invoice number for the purchase. Webtrends Analytics uses data stored in Visitor History to make sure that a page view with an invoice number is a new purchase and not the result of a visitor refreshing the page after making a purchase. If Webtrends Analytics sees a page view with an invoice number, that page view is compared against the last three invoices for a visitor. If the `WT.tx_i` value does not match the last three invoices, Webtrends considers it a new purchase.

          Note

          

Visitor Data Mart also recognizes this parameter. For more information, see “Configuring Your Web Site to Collect Visitor Data Mart Data” in the *Visitor Data Mart User’s Guide*.

          Note

          

Webtrends Express Analysis cannot use the invoice data to identify duplicate purchase records because the Express Analysis Engine does not use visitor history data.

#### WT.tx_id

`WT.tx_id=InvoiceDate` The format is `mm/dd/yy`. A 4-digit year is also allowed: `mm/dd/yyyy`.

Identifies the purchase invoice date, which is based on GMT. If the invoice date is three days older than the date of the visit, it is assumed that the hit is not an actual purchase but a view of a previously bookmarked or saved page. If the invoice date was less than three days than the date of the visit, the `WT.tx_i` parameter is used to determine if the hit is a valid purchase.

For example, a visitor makes a purchase. The purchase is accounted with an invoice date. The visitor saves a bookmark to the page. Five days later, the visitor goes to the bookmarked page. This causes another hit to be sent to SDC. However, the `WT.tx_id` parameter still contains the original purchase date. Webtrends analysis sees that the date of the hit is several days after the date found in the `WT.tx_id` parameter and determines that this is not an actual purchase.

#### WT.tx_it

`WT.tx_it=InvoiceTime` Identifies time of the invoice. The format is `hh:mm:ss` where `hh` is in a 24-hour format (`0` = midnight, `23` = 11pm).

This parameter helps determine when an invoiced purchase was made. This value is used along with `WT.tx_id` and `WT.tx_i` to determine if the purchase was a valid purchase or if this was a user refreshing the web page after a purchase or returning to the page to check status.