Why do Bills/Payments take to long to process?


I do understand the batch system banks doing in processing transactions and some takes time due to fraud checking. But I paid a Credit Card bill electronically last tuesday and the payment is not reflected yet on my card.
Why does it takes this too long? Isn’t it supposed to be processed like 1 day and next day it will be posted?

I’m paying to a big corporation and not a person so there is no more fraud checking. I’m also paying via my bank account and not cheque.

Why does it takes them so long to process this?

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