I don't understand the root cause... Did nobody at Fiserv know about example.com or the .invalid TLD?

I see this sort of thing ALL the time - documentation referring to completely made up domains like "newcustomer.com", and it soon makes its way into software becoming real world DNS lookups for these placeholder domains. Nobody ever goes back and changes them and there's no monitoring or awareness that it's an issue.

Please take a moment to read BCP 32 - https://tools.ietf.org/html/bcp32 if you do not know about example.com or the .invalid TLD.