This is using Website Payments Standard, right?
The data *is* being submitted from Zen Cart. Whether PayPal handles it correctly or not, we can't control.
Now, that said, there have been a number of updates to the WPS module in v1.3.9 which is currently available for beta preview testing feedback.
I'm not going to look at 1.3.8 problems anymore especially if they're fixed in 1.3.9. Perhaps you can test whether the problem you're experiencing exists in 1.3.9?
Granted, if it does, I'm going to point the finger back at PayPal again, because I've reviewed 1.3.9 against PayPal's published docs, and there's no reason on our site for it not to work as they document.
And ... JMHO, I have no idea why people keep trying to use Website Payments Standard when it's so unreliable in the first place. Express Checkout is so much better.
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