While I’ve seen dating services and other apps that are prone to misrepresentation reject VOIP numbers (in part because you can create them out of thin air), I’ve never seen a business that is in a position to take your money reject them. Maybe you can reach out to the business via phone or email and ask them for an alternate way to identify you.
Thanks; see post 8.
(An order I placed yesterday - a rather expensive item! - was canceled for the reason that they couldn’t verify the phone. When I called to straighten it out, they specifically asked if I didn’t have ‘another’ phone I could use...I insisted that I didn’t, and finally got it straightened out; but with a lot of wasted time.)