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This is putting it mildly. The Interac network went down and no one could use their debit cards nationwide.

I'd put that on Interac single-homing itself without redundancy.

Their ops are critical enough you'd expect better from them.

Not the kind of shortcut Canadian banking takes for core stuff.

The funny thing there is that Interac "did" have redundancy i.e. another network provider to fall back onto.

Unfortunately they failed to notice that this was a reseller for Rogers lines.

that explains a lot

Not all of it. My credit union's interac services still worked.