ACH processing

My company is looking to begin processing invoices for payment via ACH. The M3 video I watched mentioned it was processed through a third party called Paylink1.

Is that still the case?
What is the cost to be processed through the third party?
Can we opt out of the third party and import the generated ACH file to our bank on our own?

Needing the same assistance on that too. 

To the best of my knowledge M3 stopped offering the ACH service through Paylink1 in November 2021. They do offer payment services through a couple of companies that they partner with, Paymerang and Endenred(formally called CSI).  Both of the payment partners allow you to pay vendors through their service by either VCC, ACH, or Paper Checks. With both companies VCC payments earn you cash rebates.  You would want to research both companies to figure out which one would fit your needs the best.