Do you check the payment step before deciding a geo is unprofitable?

Curious how people running international affiliate traffic approach this.

Say one geo has decent click-through, landing-page engagement and even a reasonable number of people starting checkout, but the final purchase rate is noticeably worse than your stronger markets. How quickly do you assume the traffic itself is the problem?

It seems like there are a bunch of things further down the funnel that could make an otherwise decent geo look terrible, like card declines, authentication/3DS drop-off, missing local payment methods, currency friction, maybe checkout UX?

And if those purchases are what you’re feeding back into Meta/Google/etc., I imagine the effect eventually works its way back into campaign optimization too. For people doing meaningful international volume, do you normally look at checkout/payment completion by country before cutting a geo? Or in practice is the affiliate side usually too disconnected from the merchant’s payment data to diagnose that properly?

Thanks in advance.