Did you review the tutorials yet?
It's been too many years since I've used eCart, but perhaps someone on this forum will have some insight.
I have left PowerStore and eCart for a hosted application called
https://www.ecwid.com
I have had about 6 PS sites and earlier, several eCart sites. I have to say, ecwid.com is very client friendly. It has many payment options including, send a check later, etc. I found it very easy to get connected to payment interface.
Current 2 sites using the same ecwid cart: https://cts-forensics.com/store.php
If you just have a few products, there is a free version too.
With software support on WA at EOL, I am advising not spending energy on trying to learn eCart. IF/WHEN php versions move on, there won't be any updates to help you keep up with server changes.
Take advice as you wish.
