Oracle Sign up: more problems

I thought, i was successful, but:

I received a mail with the following content:

"We have re-authorized a new, specific amount on the credit/debit card used during the sign up process."

and

"To verify the account you have created, please confirm the specific amount re-authorized."


My problem: there is not any "re-authorized amount" on my banking account. I do not know, what is "re-authorized"?
Is this: this amount is charged on my credit card (then i should see it).
Or is this process buggy and i was for some reason not charged?
Or is re-authorization something else?