This page explains how to integrate E-junkie with PayPal Standard:
http://www.e-junkie.com/ej/selling-with-paypal.htm
Unlike using PayPal's cart system, E-junkie does not require you to manually edit or configure any raw HTML codes for your purchase buttons.
Once you finish our PayPal integration and set up your products in E-junkie Seller Admin, we provide you with ready-made HTML codes for your cart buttons, so you would simply copy the codes from us and paste them into the HTML source of your own Web site pages, wherever you want our buttons to appear among your own layout, text and images.
E-junkie does not support the sandbox/demo/test mode of any payment processor; we can only hand-off cart checkouts to them for real, live payments.