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PayPal test account can be created at https://developer.paypal.com/
HTML Variables for Website Payments Standard at https://cms.paypal.com/us/cgi-bin/?&cmd=_render-content&content_ID=developer/e_howto_html_Appx_websitestandard_htmlvariables
HTML Variables for Website Payments Standard at https://cms.paypal.com/us/cgi-bin/?&cmd=_render-content&content_ID=developer/e_howto_html_Appx_websitestandard_htmlvariables