Jason, that WebAssist tutorial for PayPal sandbox testing does not work with the PayFlow gateway. I've been trying to set up a testing environment for eCart 6 and PayPal Payments Advanced. I spoke to PayPal this morning and they had me set up a separate developer account for PayFlow. I also found a very recent PayPal tutorial on how to test with PayFlow (here's the link: https://ppmts.custhelp.com/app/answers/detail/a_id/929/). It's been very helpful but I'm still having issues connecting to the developer account from eCart using Layout C. There is a requirement to add a mode parameter equal to 'TEST" in the iframe:
<iframe src='https://payflowlink.paypal.com?SECURETOKEN=.......&SECURETOKENID=........&MODE=TEST' width='490' height='565'
border='0' frameborder='0' scrolling='no' allowtransparency='true'></iframe>
Do you know where I can find that line of code?