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that are saved to the database (the order is saved before the page is redirected to the payment page) but for which payment wasn t completed. Obviously, we need a payment confirmation system, along with a database structure that is able to store status information about each order. The confirmation system that you ll implement is simple. Every payment processor, including PayPal, can be instructed to send a confirmation message after a payment has been processed. We ll allow the site administrator to manually check, in the administration page, which orders have been paid for. These orders are known as verified orders. You ll see later in this chapter how to manage them in the orders-management part of the site.

In figure 12.1, the document properties from the Hello World example you made in chapter 1 are compared to a new Hello World example with metadata added.

The metadata shown in the window to the right was added using this code:

Note PayPal and its competitors offer automated systems that inform your web site when a payment has

document.addTitle("Hello World example"); document.addAuthor("Bruno Lowagie"); document.addSubject("This example shows how to add metadata"); document.addKeywords("Metadata, iText, PDF"); document.addCreator("My program using iText");

Figure 3-3. Drag a field to the Report Filter area. 2. On the worksheet, Excel adds the BusType field to the top of the pivot table, with the item (All) showing (see Figure 3-4). The values in the pivot table have not changed.

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This code snippet adds the title of the document, its author, the subject, some keywords, and the application that was used to create the PDF as metadata. If you look inside the PDF, you see that this information is stored in a dictionary, named the info dictionary, along with the creation date, modification date, and PDF producer. This is the limited set of metadata key-value pairs that is supported in PDF. Three metadata entries are filled in automatically by iText (and you can t change them). If you create a PDF from scratch, iText will use the time on the clock of your local computer as the creation and modification date. If you manipulate a PDF with PdfStamper, only the modification date will be changed. The same goes for the producer name.

been completed or canceled. However, this book doesn t visit the intimate details of any of these payment systems you ll need to do your homework and study the documentation of your company of choice. The PayPal Instant Payment Notification documentation is included in the Order Management Integration Guide, which can be downloaded at https://www.paypal.com/en_US/pdf/ PP_OrderManagement_IntegrationGuide.pdf.

PdfReader reader = new PdfReader(src); PdfStamper stamper = Gets the new PdfStamper(reader, new FileOutputStream(dest)); metadata HashMap<String, String> info = reader.getInfo(); info.put("Title", "Hello World stamped"); info.put("Subject", "Hello World with changed metadata"); info.put("Keywords", "iText in Action, PdfStamper"); info.put("Creator", "Silly standalone example"); Replaces the info.put("Author", "Also Bruno Lowagie"); metadata stamper.setMoreInfo(info); stamper.close();

With the getInfo() method, you can retrieve the keys and values as Strings. You can add, remove, or replace entries in the HashMap, and put the altered metadata in the PDF using setMoreInfo().

Now that you have an idea of what to do with that Place Order button, the next major concerns are what order information to store in the database and how to store it. As you saw in previous chapters, deciding how to store information helps you get a better idea of how the whole system works.

Figure 3-4. The BusType field added to the Report Filter area 3. Click the drop-down arrow to the right of (All) to see a list of business types. Each business type from the source data is listed here. 4. You d like to filter the data to see only the manufacturing business types, so click Manufacturing, and click OK (see Figure 3-5).

Can I change the producer info The value for the PDF producer tells you which version of iText was used to create the document. It s also a way to tell the end users of the document that iText was used to create it. You can t change this without breaking the software license that allows you to use iText for free.

A dictionary is a PDF object, and the values that are stored in this dictionary are also PDF objects. PDF viewers such as Adobe Reader don t have any problem interpreting these objects, but applications that aren t PDF-aware can t find or read this meta-information. The Extensible Metadata Platform (XMP) was introduced to solve this problem.