Our solution is real-time processing, but a third-provider solution where clients have to leave our site. This will not change.
Payment does work on all sites, except sometimes (maybe 1 order out of dozens), so finding the logic is not easy.
We are good developpers and are used to debugging, this is not an easy one.
Settings are simple in ZC for such payments and they are similar on all sites including on those never having an issue. It's more likely linked to a connection or firewall issue but then again we have tried everything so far.
The question is about logging data and finding possible hacks or modules that would have solved that issue earlier - I know several people had it.
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