I’m having the same problem! The test worked fine but now real sales won’t go through.
There is another thread on this problem from about 7 months ago, and a vague bit of code was suggested to change which I tried and it did not resolve the problem.
This appears to be a serious problem and one would assume it would have been addressed by now!
Please give us help on this with FULL code to fix it, or supply a patch or even a new php file.
(Meanwhile no sales are going through)
Many thanks,
–Rob