for my $i (0 .. $#{ $self->{trolley} }) {
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This isn't python, the last element in the range is not excluded!

I wouldn't know...my knowledge of python is non-existent. I wouldn't recognise the code unless the file had a .py extension!

I actually originally wrote:

for my $i (0 .. $#{ $self->{trolley} }) {
    # ...
}
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but thought it would be better to omit the code block completely in providing the example.

The problem is not the type of for loop, the problem is starting at the beginning of the array when changing the number of elements in the array.

If you are going to remove elements of an array in a for loop you have to start at the end of the array.

So this might work UNTESTED:

for my $i ( reverse 0 .. $#{ $self->{ trolley } } )
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Sorry, I wasn't thinking that changing the loop would cure the issue. Just noting that I intended to review that bit of code anyway.

However...there doesn't seem to be a problem! I set up this test code to observe the problem highlighted and to be sure I have cured it.

#!/usr/bin/perl

use CGI::Carp qw(fatalsToBrowser);

use cPanelUserConfig;
use Bod::Stripe;
use Data::Dumper;

use strict;

print "Content-type: text/plain\n\n";
    
my $stripe = Bod::Stripe->new(
    'api-secret' => 'sk_test_5xxxxxxxnChHzDo',
    'api-public' => 'pk_test_5xxxxxxxxmbegPN',
);

if ($stripe->success) {
    my $res = $stripe->add_product(
        'id'            => '4E',
        'name'            => 'Dog food',
        'description'    => 'Boomer\'s favourite variety',
        'qty'            => 4,
        'price'            => 69,
    );
    $stripe->add_product(
        'id'            => 2,
        'name'            => 'Dog treats',
        'qty'            => 2,
        'price'            => 150,
    );
    
    $stripe->add_product(
        'id'            => 8,
        'name'            => 'Bod treats',
        'qty'            => 10,
        'price'            => 650,
    );

    list('A');
    $stripe->delete_product('2');
    list('B');
    $stripe->delete_product('4E');
    list('C');
    
} else {
    print "FAILED: " . $stripe->error;
}



sub list {
    print "-- $_[0] --\n";
    foreach ($stripe->list_products) {
        print "-> $_\n";
    }
    print "\n";
}
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and it behaves exactly as I would expect giving this output:

-- A --
-> 4E
-> 2
-> 8

-- B --
-> 4E
-> 8

-- C --
-> 8
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So deleting more than one product doesn't appear to be a problem.