purchase_truce_interaction_work_out_purchase_cost_effect

purchase_truce_interaction_work_out_purchase_cost_effect = {
	scope:puppet_or_actor = {
		if = {
			limit = {
				has_personal_tenet_flag = tenet_peace_of_god_personal_truce
			}
			# Small cost.
			if = {
				limit = { always = scope:pt_sum_small }
				add_piety = {
					value = pt_sum_small_value
					multiply = -1
				}
				scope:recipient = {
					add_piety = scope:puppet_or_actor.pt_sum_small_value
				}
			}
			# Large cost.
			else_if = {
				limit = { always = scope:pt_sum_large }
				add_piety = {
					value = pt_sum_large_value
					multiply = -1
				}
				scope:recipient = {
					add_piety = scope:puppet_or_actor.pt_sum_large_value
				}
			}
			# Medium cost; we do this last as a fallback.
			else = {
				add_piety = {
					value = pt_sum_medium_value
					multiply = -1
				}
				scope:recipient = {
					add_piety = scope:puppet_or_actor.pt_sum_medium_value
				}
			}
		}
		else = {
			# Small cost.
			if = {
				limit = { always = scope:pt_sum_small }
				pay_short_term_gold = {
					target = scope:recipient
					gold = {
						value = 0
						add = pt_sum_small_value
					}
				}
			}
			# Large cost.
			else_if = {
				limit = { always = scope:pt_sum_large }
				pay_short_term_gold = {
					target = scope:recipient
					gold = {
						value = 0
						add = pt_sum_large_value
					}
				}
			}
			# Medium cost; we do this last as a fallback.
			else = {
				pay_short_term_gold = {
					target = scope:recipient
					gold = {
						value = 0
						add = pt_sum_medium_value
					}
				}
			}
		}
	}
}

As written in game/common/scripted_effects/03_dlc_fp2_scripted_effects.txt.