Seems to be happening again. I purchased XAM'd episode 9 at 12:17 am EST but now when trying to buy a video 9 hours later I get the same error (80023103). Hope it gets sorted out soon.
According to the Sony tech (by telephone), 80023103 occurs when the Playstation Store or PSN is undergoing maintenance.
Sony recommended adding funds to PSN accounts on any day other than Thursdays.
I'll try again today (Friday) to redeem the PSN Network Card... (Hope this works!!!)
Ya same thing happened to me so i went down to my local GAME stoore and bought a playstation network card - i downloaded the map pack and installed it but it says i ahven't got it. I thought i could get round the system and failed at another hurdle lol.
But apparently using the network card and downloading and isntalling will work fine and it will work depending upon which region u live - so looks like ill have to wait a while like everyone else.
At least it is not as big a **bleep** up as the xbox version.