Hi Josh,
On reflection, I should not have used the word 'professional'. As originally, there never was a professional Express Invoice in the App Store.
In reply to your 1st question.....I downloaded (on 10 Sep 2013) the ONLY available iPad App which interestingly back then was called "Express Invoice HD Free Invoicing App". It was version 3.81 then. (I am unable to recall what the 'HD' means, but you may be able to clarify for me.) This App offered 'Top In-App Purchases', which I subsequently purchased 'Express Invoice' for the then going full amount of $10.49 on 26 Oct 2013, the day after I installed version 3.91.
Since then, I downloaded every version - with recognition of my original payment of Express Invoice, except when I installed this current version 4.38.
Why is it since I downloaded this current version 4.38 the App no longer recognises my Top In-App purchase of Express Invoice? For instance, the advertisements are popping up - and requires a payment of $1.29 to make them not appear. And as I have more than 5 customers - requires a payment of $6.49. Can you confirm - why am I being treated as unpaid user?
Importantly, to whom is it best to report this issue, so it is solved URGENTLY. Thanks.