Soon after I filed on 4/5, I received notifications that both my CA and Federal tax returns were accepted.
On 4/6, CA took my tax payment.
It has now been more than 10 business days and 14 calendar days since I filed my taxes and my federal tax payment has not been made (note that IRS requests that 10 days elapse before assuming an issue).
I called the IRS again today, 4/18, and I spoke with an agent who provided options for me to pay:
1. EFT.gov
2. IRS website
I will try to pay directly using the sites mentioned by the IRS agent.
