When are battle plan costs paid, and when can the attacker declare plans?

Question

Accepted Answer

Costs are paid in campaign step 3, before dice are rolled, even when a plan's effect matters only at the end. The attacker may declare plans at any point in steps 1 to 3, before the defender declares in step 4.

Oath: Chronicles of Empire & Exile

When are battle plan costs paid, and when can the attacker declare plans?