Link Builder for PayPal 1.1

LinkBuilder helps you generate PayPal payment URL links.
LinkBuilder also supports more complex PayPal payment links parameters:
- Apply a shipping cost.
- Apply a discount (amount or percentage).
- Apply tax (amount or percentage).
- Add invoice and item number, or a custom variable.
- Custom payment page.
- Custom text on "Continue" button.
- Custom text on "Note to Merchant" text entry box.
- Custom header image or logo.
- Specify a return URL for completed or cancelled transaction.
- Specify a return URL for script notification.