The process is be prepared for the most aggravating series of chat and e mail tag with people who can't do squat about it, and who transfer the issue to someone else, probably with gross errors in the actual issue.  I actually had them transfer three payments via ACH to an account not provided to them by myself or the vendor.  How this could have happened I have never obktained anything that approaches a valid explanation.  After at leat 60 interactions over a months time, I was fortunate to get the two larger transfers returned to me, but they say they can't do squat about the third.  You know what that means?  I had to pay the vendor again, and Melio won't tell me where the original payment went, or where they got some routing information from that is not my vendor.   

I would suggest using any method of payment other than Melio.