The standard Partner Program threshold is 1,000 subscribers plus 4,000 valid public watch hours in the last 12 months, or 10 million valid Shorts views in 90 days. Check YouTube Studio for the current rules in your country.

No. Shorts views do not count toward the 4,000 watch hours; they have their own Shorts views route.

You only pay for what is delivered. If an order is canceled or only partly delivered, the undelivered part goes back to your wallet automatically.