Setting up Website Payments Pro

[TriumphShop]

Hello,
Info first:
Using Zen Cart v1.3.8a
I've made the changes to the php file as described to handle the new PayPal URL.
The installation is not customized significantly yet (just text changes).
In my PayPal account, I have retrieved relevant API signature info and input that into the PayPal Express Checkout module.
I have also retrieved the PayFlow Partner, Vendor, User and Password info and put that into the relevant fields.
I have both PayPal modules set to PayFlow UK.
I have granted API access via my PayPal account to my API username (I am assuming this is the same as my API signature username?)
I still cannot process a credit card transaction. Where am I going wrong?

[DrByte]

I have granted API access via my PayPal account to my API username (I am assuming this is the same as my API signature username?)

Not sure why you bothered with that, since it's not in the instructions, and is not required for Zen Cart use. That's typically only something that's done if you intend to authorize a 3rd-party to submit transactions on your behalf, which is not how Zen Cart works.

I still cannot process a credit card transaction. Where am I going wrong?

Well ... "cannot process a credit card transaction" doesn't give anything to go on in terms of what might be "wrong". Perhaps you could at least give some information related to what error message you're getting (or at least confirm whether you're getting any error messages or not), and any other symptoms that might be relevant, such as what "does" happen compared to what you "wanted" to see happen, etc?
And/or turn on PayPal debug logging and include logs in your post? http://www.zen-cart.com/forum/showthread.php?t=61199

[TriumphShop]

Very sorry. It's working fine, the credit card was unactivated I think. Tried another card it worked fine. Monies have been deposited into the PayPal account correctly.
Have turned on debugging as suggested and removed the third-party API access grant - just got confused as to whether this was necessary.
Has been a breeze to setup so far (my inabilities notwithstanding), great product, thanks.

[DrByte]

Glad you got that sorted out :)