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Duplicated fields are concatenated by processor.
If you have a FAAS form that has accidentally gotten 2 quantity for the same product fields in it (which I know is wrong, but accidents still happen), the Post Processor Concatenates those fields causing massive overcharges to appear.
For example:
<input name="Quantity1" id="Quantity1" value="1" type="hidden" />
And then the client later on adds this somewhere else on the form
<input name="Quantity1" id="Quantity1" value="1" type="hidden" />
Then the Transaction gets processed as:
<Quantity>11</Quantity>
It would be better to either, ignore subsequent values, or return an error about multiple quantities being passed.
Pretty much, doing anything other than combining them would be a better solution than surprising a donor with with an exponentially larger withdrawal from their credit card.
For example:
<input name="Quantity1" id="Quantity1" value="1" type="hidden" />
And then the client later on adds this somewhere else on the form
<input name="Quantity1" id="Quantity1" value="1" type="hidden" />
Then the Transaction gets processed as:
<Quantity>11</Quantity>
It would be better to either, ignore subsequent values, or return an error about multiple quantities being passed.
Pretty much, doing anything other than combining them would be a better solution than surprising a donor with with an exponentially larger withdrawal from their credit card.