Hi Malte,
I wouldn't give a quote based on this :) However: what's the G/L Open Items module you're using? It depends a little on this. Not all have this apply-by oldest with file no. feature (AFAIK, only SIOI has this). You might also consider some other things:
- Fraud / unusual behaviour detection: The first application to a voucher should fix the assigned customer. All further application attempts with different customer nos. should flag a warning. But this must already happen in the shop, not when you try to post the batch. So, this must be part of the "Apply a voucher for payment" web service.
- "Voucher used up" functionality. Also part of the web service.
To give a qualified quote we (Smart IT) would need to have a look over the whole shop interface. But assuming you would like to implement only this feature with Smart IT OpenItems (SIOI), it would come down to:
- buying a SIOI license
- making the merge with your NAV installation (we offer this service, and usually we're faster at it)
- doing a setup and (if already a live system) a conversion run
Up to here we're usually under a week.
- making the expiry batch: less than a week.
Of course, these figures are too inaccurate to give a quote, but you have an impression. In relation to the overall complexity of SIOI it's maybe 5% customization. If you have more questions, please feel free to contact me directly.
with best regards
Jens