If it was included on your return when you filed, it was transmitted to the IRS.

What if on my tax information. I had an account with Walmart money card. Will I receive my impact payment? Through a pre paid debit card

 I received my federal tax return on the same account.

Your stimulus check will go to the bank listed on your tax return.

If you have your tax return it is listed on page 2 of your 1040 on lines 21 b & c

It is also noted at the top of the filing Instructions.

How do i update banking information

The IRS is in the process of creating a site

If you only want to change your Direct Deposit Information

The Treasury is expected to shortly announce an online portal where direct deposit information can be supplied to the IRS. Here is what you should do: 

Go to  http://www.irs.gov/newsroom/economic-impact-payments-what-you-need-to-know to see if they have set up the online portal. (This article will be updated with the web address once it’s available.)