The IRS is going to give taxpayers the chance to enter their own banking information.  See the following:

The IRS does not have my direct deposit information. What can I do?

In the coming weeks, Treasury plans to develop a web-based portal for individuals to provide their banking information to the IRS online, so that individuals can receive payments immediately as opposed to checks in the mail.

https://www.irs.gov/newsroom/economic-impact-payments-what-you-need-to-know

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If you have not filed a return, or need to file a simple return to qualify for the Stimulus money, TurboTax setup where you can file a simple return for the stimulus money (if you are on Social Security or Disability, you do not have to file anything to get the stimulus money). See the following, scroll down to  What do I need to do to get my stimulus payment?, then  If you don’t need to file your taxes this year

https://turbotax.intuit.com/stimulus-check/