cart system 3d secure coding help in PHP Coding Help Posted February 9, 2016 You sir are a genius! It now passes the correct amount, will that line of code only affect the $centinel_total string? The tax amount isn't used by them but their logs show an incorrect amount there too, would I just add the same sort of thing above the $centinel_vatamont string? Someplace in the code that is not shown it is inserting commas to separate thousands digits, I'm sure to make it easier for humans to read. I suspect it does it for the tax too but I can't tell without see the code in question. In any case, you'd need a very expensive cart to have taxes that high and a similar line to strip the commas would work. Barand is right - you should not store the values with the commas but we'd need to see all of the code to properly fix it.