According to the Santa Barbara TPG CARES Act Update website:
The IRS will issue direct deposits to taxpayers that requested a direct deposit disbursement or applied for a new debit card when they prepared their own return online. An IRS-issued check will be mailed to taxpayers that requested a check printed from their tax professional's office, Walmart Direct2Cash or a Walmart MoneyCard issued by their tax professional.
If a payment is returned to the IRS (Ex. bank account is closed), the IRS will mail a check to the taxpayer.
In the rare event that payments are inadvertently sent to TPG, a plan is in place to help identify and expedite the return of these payments to the IRS so that the IRS can reissue payments directly to affected taxpayers as soon as possible. If we are unable to identify the payment as an Economic Impact Payment, the deposit will be processed as a federal refund, with all associated fees withheld from the deposit amount.
We understand that taxpayers need their refund or EIP more than ever, so we are committed to getting money to taxpayers as quickly and easily as possible.
