Are my payments down if Pricery is down?

A very legitimate question for any business to ask.

"Are customers going to be able to pay if Pricery is down"?

Short answer: Yes.
Pricery is an overlay on your existing pricing system, meaning that it's one layer above your current pricing's values, links, and logic. If Pricery goes down for whatever reason, your localized prices won't be displayed anymore, but your old USD pricing will absolutely keep working.