Password

How many passwords do you have? There must be a lot! Bank account, Student ID number, any security, and more. Now, I have a problem... I have a credit card and I used it so often last month. However, I forgot how much I spent... Then, the only way to confirm is to log-on the web site of the credit card's firm. What was my ID number!? I fought against it for more than 20min., but ..... What I can do is to hope it won't be too much...