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Most cards hold pament when they are new for 6 months. My experience has been Walmart not holding payments unless past a certain amount. I made a large payment on my Walmart card last week and they still have not released the avilable credit.
Xace
Mine always posts in about 36 hours. When I make my payment in the store, it takes 2-3 days to post, but my balance shows the payment immediately.
Walmart is slow post when you're new. I would pay and my balance would be updated usually the next day...it wouldn't return to available credit for line a week or so. They aren't the only folks who do this...I've noticed it with quite a few of my Synch cards...PenFed also hold payments when you're new.
When I mae a payment on on a synchront account (sams walmart amazon america eagle etc...) the available credit reflects immediatly (this is after my first payment thru they're online portal - they verify the account like amex does first then they release the hold for now on....