I'm getting error code 2037 since 2 days when I try to buy something on Itunes. Credit card works fine. Would like problem to be solved asap.

You have 2 avenues to pursue with this.
First,give iTunes the opportunity to fix the problem.
The Cust Service # that works best for people seems to be 800-676-2775.At each voice prompt enter 0(zero),until you get to an actual human.Have the card used handy,plus the account information for iTunes.
If that doesn't work,though it most likely will,call your Credit Card Co. and dispute the amount overcharged.Don't try and get it for free,or you'll be charged again,and that's only fair.The # should be on the back of your cerdit card itself.

Based on Apple "Gift certification, allocation breaks, and prepaid credit card are utilized first. .If you've number free tune credits or present certificates, prepaid cards, or allocation credits, your charge card is charged for the tracks you buy."

Therefore more straightforward to check always your breaks outstanding before and after getting items on free itunes codes

"This error is caused by entering an incorrect credit card or debit card postal code.

To solve this error :

Check if you have properly entered your credit card or debit card postal code and try again.

If this problem still occurs, try contacting your credit card or debit card company for further assistance.

There might also be an issue communicating with Nintendo's servers.

Please wait at least a few hours and try again."

Source:
http://www.wiierrorcodes.com/wii-error-208008.php

I suggest going onto the developers site via iTunes and try finding a 'contact us' button and tell them your problem, you have the evidence that you're getting charged because of your bill statement.

1045 - 0436 - 9551 - 0266 - 5984 - 9386 for authorization code

This is an APPLE store anamoly, not a problem with your computer, or the software in it
it is on APPLE's end of the internet, and it says the problem should be rectified within a few days, and they are sorry it has caused so many customers to be upset with them over it.

this is a recurring issue with itunes - something goes wrong and it throws up error 2037. You can be sure it is a problem their end not yours and you just have to wait for it to be fixed.

im going through the same problem if you solve it please email me and tell me how
[email protected]

Check to make sure the card you're using is not a debit card. Apparently only a credit card will work for the iTunes if purchasing directly from the iPhone. Oddly enough, debit cards are accepted for the online (non-mobile) iTunes store.

In order to fix this problem, go to billing info, and when it lets you choose the credit card method, choose the option "none" then it will let you use your gift card. Otherwise it assumes you want to use a credit card. Hope this helps.