Plain PayPal Button and PDF Stamper Integration Guide
The WP PDF Stamper plugin can be integrated with a plain PayPal buy button so you can send a stamped copy of your eBook that you are selling after the customer makes a purchase.
To use a plain PayPal button with WP PDF Stamper you need two pieces of information:
- The URL of the PDF eBook that you are selling
- The URL of the IPN handling script
For this integration you simply have to specify the URL of the eBook that you are selling in the “custom” field of the button and set the “notify_url” value to the IPN (Instant Payment Notification) handling script that comes with the plugin. The IPN handling script is stored in the “api” directory inside the “wp-pdf-stamper” plugin. The URL of this IPN handling script will be similar to the following when the plugin is uploaded to your server:
http://www.your-domain-name.com/wp-content/plugins/wp-pdf-stamper/api/ipn_handler.php
You need to specify the URL of this IPN handling script in your PayPal button’s code (you specify this URL in the “notify_url” field). For example:
<input name="notify_url" type="hidden" value="http://www.your-domain-name.com/wp-content/plugins/wp-pdf-stamper/api/ipn_handler.php" />
This basically tells PayPal to send the payment confirmation notification to this script so the sale can be processed (stamp the eBook and email it to the buyer).
There is one other piece of information that you need to include in the button which is the URL of the PDF eBook. This is the file that the plugin will make a copy of then stamp it with the customer details and send it via email. You can specify the URL of the PDF eBook in the “custom” field of the PayPal button. For example:
<input name="custom" type="hidden" value="http://www.your-domain-name.com/wp-content/uploads/2010/06/my-ebook.pdf" />
Example Button Code
The following is an example button code that shows how the button code looks
PayPal Hosted Button
If you are creating a PayPal hosted button for added security then you simply have to add the necessary information in the advanced variables section. When you create your button on PayPal from the “Merchant Services” menu, you will be able to specify some advanced variables in “Step 3″ of the button creation process.
Option to specify advanced variables
You need to add the URL of the IPN handling script to the “notify_url” field and the URL of the eBook that you are selling to the “custom” field. First, prepare this information on a text file like the following:
notify_url=http://www.your-domain-name.com/wp-content/plugins/wp-pdf-stamper/api/ipn_handler.php
custom=http://www.your-domain-name.com/wp-content/uploads/2010/06/my-ebook.pdf
Once you are ready check the “add advanced variables” checkbox shown in the screenshot then copy and paste the above prepared text into the textarea.
After generating the button code, you can copy this code and paste it on the eBook selling page of your site. When someone makes a purchase using this button the WP PDF Stamper plugin will stamp a copy of the original eBook with the customer details and send it to him/her via email.
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