Grant Pardon

is_available = trigger_if = {
	limit = {
		is_ai = yes
	}
	OR = {
		ai_vengefulness <= 0
		culture ?= {
			has_cultural_parameter = pardoning_gives_loyalty
		}
	}
}
is_shown = scope:puppet_or_actor ?= {
	OR = {
		has_imprisonment_reason = scope:recipient
		AND = {
			has_title = title:e_minister_of_justice
			scope:recipient = {
				any_liege_or_above = {
					has_imprisonment_reason = scope:recipient
				}
			}
		}
	}
}
scope:recipient = {
	OR = {
		scope:puppet_or_actor ?= {
			has_title = title:e_minister_of_justice
			top_liege ?= scope:recipient.top_liege
		}
		target_is_liege_or_above = scope:puppet_or_actor
	}
}

As written in game/common/character_interactions/00_vassal_interactions.txt.

trigger_if = {
	limit = {
		scope:is_puppet_action ?= yes
	}
	scope:puppet_or_actor = {
		influence >= pardon_interaction_influence_cost_value
	}
}
trigger_if = {
	limit = {
		scope:is_puppet_action ?= yes
	}
	scope:puppet_or_actor = {
		treasury >= pardon_interaction_treasury_cost_value
	}
}

As written in game/common/character_interactions/00_vassal_interactions.txt.

on_accept = if = {
	limit = {
		scope:is_puppet_action ?= yes
	}
	scope:puppet_or_actor = {
		if = {
			limit = {
				pardon_interaction_influence_cost_value > 0
			}
			change_influence = {
				value = {
					add = pardon_interaction_influence_cost_value
					max = influence
					multiply = -1
				}
			}
		}
		if = {
			limit = {
				pardon_interaction_treasury_cost_value > 0
			}
			remove_treasury = {
				value = {
					add = pardon_interaction_treasury_cost_value
				}
			}
		}
	}
}
if = {
	limit = {
		scope:puppet_or_actor = {
			has_title = title:e_minister_of_justice
		}
	}
	scope:puppet_or_actor = {
		add_merit_if_relevant_effect = {
			MERIT = minor_merit_value
		}
		if = {
			limit = {
				government_has_flag = government_has_influence
			}
			change_influence = {
				value = minor_influence_gain
				multiply = scope:recipient.highest_held_title_tier
			}
		}
	}
	scope:recipient = {
		send_interface_toast = {
			type = event_toast_effect_neutral
			title = pardon_interaction_toast_title
			desc = pardon_interaction_toast_minister
			right_icon = scope:puppet_or_actor
			if = {
				limit = {
					OR = {
						scope:recipient.liege = {
							has_extra_criminal_reason_against_trigger = {
								CRIMINAL = scope:recipient
							}
						}
						is_close_or_extended_family_of = scope:puppet_or_actor
					}
				}
				scope:puppet_or_actor = {
					change_strife_opinion = massive_strife_gain
					situation:dynastic_cycle = {
						trigger_situation_catalyst = {
							catalyst = catalyst_minister_pardoned_dangerous_criminal
							character = scope:puppet_or_actor
						}
					}
				}
			}
			consume_all_criminal_reasons_effect = {
				LIEGE = scope:recipient.liege
				CRIMINAL = scope:recipient
			}
		}
	}
	hidden_effect = {
		scope:recipient.liege = {
			send_interface_toast = {
				type = event_toast_effect_neutral
				title = pardon_interaction_toast_title
				desc = pardon_interaction_toast_minister_liege
				right_icon = scope:puppet_or_actor
				left_icon = scope:recipient
				show_as_tooltip = {
					if = {
						limit = {
							OR = {
								has_extra_criminal_reason_against_trigger = {
									CRIMINAL = scope:recipient
								}
								scope:recipient = {
									is_close_or_extended_family_of = scope:puppet_or_actor
								}
							}
						}
						scope:puppet_or_actor = {
							change_strife_opinion = massive_strife_gain
							situation:dynastic_cycle = {
								trigger_situation_catalyst = {
									catalyst = catalyst_minister_pardoned_dangerous_criminal
									character = scope:puppet_or_actor
								}
							}
						}
					}
					consume_all_criminal_reasons_effect = {
						LIEGE = scope:recipient.liege
						CRIMINAL = scope:recipient
					}
				}
			}
		}
	}
}
else = {
	scope:recipient = {
		send_interface_toast = {
			type = event_toast_effect_neutral
			title = pardon_interaction_toast_title
			desc = pardon_interaction_toast
			right_icon = scope:puppet_or_actor
			consume_all_criminal_reasons_effect = {
				LIEGE = scope:puppet_or_actor
				CRIMINAL = scope:recipient
			}
		}
	}
}
scope:puppet_or_actor = {
	stress_and_fulfillment_impact = {
		forgiving = medium_stress_loss
	}
}
scope:puppet_or_actor = {
	if = {
		limit = {
			culture = {
				has_cultural_parameter = pardoning_gives_prestige
			}
		}
		add_prestige = minor_prestige_gain
	}
	hidden_effect = {
		if = {
			limit = {
				fp3_struggle_involves_one_supporter_and_one_detractor = {
					FIRST = scope:puppet_or_actor
					SECOND = scope:recipient
				}
				scope:recipient = {
					any_character_struggle = {
						involvement = involved
						phase_has_catalyst = catalyst_grants_pardon_supporter_detractor
						is_secondary_character_involvement_involved_trigger = {
							CHAR = scope:puppet_or_actor
						}
					}
				}
			}
			every_character_struggle = {
				involvement = involved
				activate_struggle_catalyst = {
					catalyst = catalyst_grants_pardon_supporter_detractor
					character = scope:recipient
				}
				log_debug_variable_for_persian_struggle_effect = {
					VAR = concession_catalyst_grants_pardon_supporter_detractor
				}
			}
		}
	}
}
scope:recipient = {
	if = {
		limit = {
			scope:puppet_or_actor = {
				culture = {
					has_cultural_parameter = pardoning_gives_loyalty
				}
			}
		}
		add_opinion = {
			modifier = loyal_servant
			target = scope:puppet_or_actor
		}
		scope:puppet_or_actor = {
			if = {
				limit = {
					can_add_hook = {
						target = scope:recipient
						type = loyalty_hook
					}
				}
				add_hook = {
					type = loyalty_hook
					target = scope:recipient
				}
			}
		}
	}
	else = {
		add_opinion = {
			target = scope:puppet_or_actor
			modifier = grateful_opinion
			opinion = 15
		}
	}
}
add_clan_unity_interaction_effect = {
	CHARACTER = scope:puppet_or_actor
	TARGET = scope:recipient
	VALUE = minor_unity_gain
	DESC = clan_unity_forgiveness.desc
	REVERSE_NON_HOUSE_TARGET = no
}

As written in game/common/character_interactions/00_vassal_interactions.txt.