[i have a walmart money card fully set up but it wont work?]

i got my walmart money card in the mail today after buying one in the stor a few days ago and i set it up about 30mns ago do i just need to give it time to register or do they just not work with SL?

 

[i just got a walmart pre paid card 2 days ago plz help me find out why I cant get it to work with SL]

i have it all set up but when i try to buy L$ it sais i have a problem charging my payment method? plz help=(