What is the process file with Trobotax and paying federal and state taxes. Online

After you enter and review all info in TT, you select eFile option. You need to create a PIN, provide DL data, and enter Direct Deposit info if applicable. The Fed is usually free, state returns usually have a charge that you can pay with CC, or deduct from your refund for an extra $40 fee.

If I understand your question correctly.  You want to E-file and pay taxes due with a secure process.  The best way is to provide a checking, or savings account with the return.  No one except the IRS will see this information, not even TurboTax.