G'day James,
I see ++philiprbrenan has solved the Useless use of a constant ... problem.
For the malformed JSON ... problem, it might be better to look at your input JSON rather than what's being output with the error message. Try:
my $code = $tesco->product_search({ searchtext => $pn, extendedinfo =>
+ 'N' });
print $code, "\n";
exit;
You might be able to see the problem by inspection; if not, try running it through the validator you mentioned earlier.
[Aside:
I'll just point out that chomp is a safer version of chop. Of course, you might have a perfectly valid reason for choosing chop.]
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