Charging The 16p Supplement Charge Separately Causing Issues With Accounts Software Package
This is causing havoc with my accounts package. If I have to pay an extra 16pence, it should be taken off at source, as it is difficult to balance books with an after the fact transaction.

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Craig Owen commented
You can manually edit each item and tick the box to prepay the amount. However, this takes away the benefit of uploading an order. It would be good if there was a setting to include the 16p in the shipping price by default or a setting in the API to charge it with the postage
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RWAP commented
It looks as though free collection will end in January 2024 anyway.
I am amazed that if you send 10 orders using Trached 24 via the post office, you could end up with 1 x 16p charge, or 10 individual 16p charges.
I can't imagine that after the credit card processing fees on those 16p charges, it even benefits Royal Mail!