Broadcasting Multiple SSID and Allowing Walled Garden Access

Hi

I own a Mall. I want to be able to broadcast multiple SSID's from my router and direct my potential clients to a discount code for each venue in the mall.

Example: a hungry client is within range of my access point, they decide to opena a browser on their smartphone, My access point is broadcasting

I understand the 32 character rule for ssid but for arguments sake.

SSID 1 - Happy Hour at Marcos Italian 10% Off Click Here.
SSID 2 - 2 for 1 Meals at Pizza Joes Click here
SSID 3 - 50% off at Jims Jewellery click here

Etc. etc.... I have been told I can only have 16 SSID's on 1 access point?!?
I want to be able to take the potential customer to a page where they can note the discount code and present it in store. I dont want them to be able to use my access point to surf, only to view a page with details of each offer.

I will have a mast which broadcasts throughout the Mall.

Can anyone tell me the best way to do this? I understand there may be other hardware required but Im trying to keep this as compact and low maintenance as possible

Thanks

D