INFORMATION REGARDING THE IRS PAYMENT PORTAL FOR CORONAVIRUS STIMULUS CHECKS:
If the IRS does not have your payment information, you can enter it here at their portal. https://sa.www4.irs.gov/irfof-wmsp/notice
Do note: If you have ‘0’ as your refund amount, etc., it may not work yet as many have been experiencing technical issues with this. As of 04/17/2020, a solution for this was still being looked into and/or developed, according to this thread here. https://www.reddit.com/r/IRS/comments/g236kx/zero_filers_those_who_filed_taxes_but_dont_owe_or/