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This is also something that depends heavily on regulations. In my home country, invoice numbers have to be sequential by law, although you can restart the numbering every year.

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Yes, even if it's not a legal requirement it's definitely best practice to have sequential invoice numbers. I thought about this at the time but these numbers aren't invoice numbers, only order numbers.

A global sequence, or sequence-per-account? I suspect the latter?

A sequence per "series", where a series can be a fiscal year, a department or category, etc. But I am not sure if you can have one series per customer, I only find conflicting information.

You can have more details here, in the section "Complete invoice":

https://sede.agenciatributaria.gob.es/Sede/en_gb/iva/factura...

https://www.boe.es/buscar/act.php?id=BOE-A-2012-14696#a6 (Spanish only)

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