That's what I did last time... I didn't know if there was some automated integration with eCart... There is/was a checkbox for the sandbox in the wizard and I left it checked on...
Where do I turn it off? All it did was prevent transactions from getting past stage 1.
Also, eCart seemed to mandate express checkout, but my client decided she doesn't want it. Is just removing the paypal button from the checkout pages sufficient to remove that option?
BTW, thanks for your fast help!