Illya,
Thanks!!!!! - I honestly believe that someone who has done this before can tell me the best way to 'really' test this - and get the right amount of debugging information as possible.
Also of note - the 'sandbox' store - believes - that after I submit my 'buy' transaction below - that I now 'own' the product.... because on future buys past the first one (below) - the Storekit platform prompts me that I already own the product - would I like to download it again - for free.
Bottom line - the transactions are being implemented at least at some level. Someone who's done this before can likely look at this in 5 minutes and tell me what to do next.....
best,
Bruce