Buy Claim

is_shown = scope:puppet_or_actor ?= {
	is_landless_adventurer = no
	OR = {
		AND = {
			has_perk = sanctioned_loopholes_perk
			NOR = {
				government_has_flag = government_has_merit
				pam_beseech_claims_access_trigger = yes
				government_has_flag = government_is_japan_feudal
				government_has_flag = government_is_japan_administrative
			}
		}
		AND = {
			any_character_struggle = {
				involvement = involved
				has_struggle_phase_parameter = unlocks_buy_claim_for_all
				is_secondary_character_involvement_either_trigger = {
					CHAR = scope:recipient
				}
			}
		}
	}
	NOT = {
		target_is_liege_or_above = scope:recipient
	}
}
NOT = {
	scope:puppet_or_actor ?= scope:recipient
	AND = {
		scope:recipient = scope:puppet_or_actor.faith.religious_head
		scope:puppet_or_actor.rite ?= {
			NOT = {
				rite_has_doctrine = doctrine_theocracy_temporal
			}
		}
	}
}
scope:recipient = {
	is_playable_character = yes
	primary_title.tier > tier_barony
	NOT = {
		target_is_liege_or_above = scope:puppet_or_actor
	}
}

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

trigger_if = {
	limit = {
		scope:target ?= {
			any_claimant = {
				this = scope:puppet_or_actor
			}
		}
	}
	custom_description = {
		text = buy_claim_has_pressed_claim_already
		always = no
	}
}
trigger_if = {
	limit = {
		scope:target ?= {
			tier = tier_barony
		}
	}
	custom_description = {
		text = buy_claim_has_pressed_claim_already
		always = no
	}
}
trigger_if = {
	limit = {
		scope:target ?= {
			tier = tier_kingdom
		}
		scope:puppet_or_actor.highest_held_title_tier >= tier_kingdom
	}
	custom_description = {
		text = buy_claim_no_king_or_emperor_kingdom
		always = no
	}
}
trigger_if = {
	limit = {
		scope:target ?= {
			tier >= tier_empire
		}
		scope:puppet_or_actor.highest_held_title_tier >= tier_empire
	}
	custom_description = {
		text = buy_claim_no_emperor_empire
		always = no
	}
}
trigger_if = {
	limit = {
		scope:target ?= {
			is_head_of_faith = yes
		}
	}
	custom_description = {
		text = buy_claim_no_religious_titles
		always = no
	}
}
trigger_if = {
	limit = {
		scope:target ?= {
			has_clerical_region = yes
		}
	}
	custom_description = {
		text = buy_claim_no_religious_titles
		always = no
	}
}
trigger_if = {
	limit = {
		scope:target ?= {
			is_noble_family_title = yes
		}
	}
	custom_description = {
		text = buy_claim_no_noble_family_titles
		always = no
	}
}
trigger_if = {
	limit = {
		scope:target ?= {
			has_variable = adventurer_creation_reason
		}
	}
	custom_description = {
		text = buy_claim_no_landless_adventurer_title
		always = no
	}
}
scope:puppet_or_actor = {
	trigger_if = {
		limit = {
			exists = scope:target
			scope:target = {
				tier = tier_county
			}
		}
		piety >= {
			value = minor_buy_claim_piety_value
			if = {
				limit = {
					government_has_mechanic = administrative
				}
				multiply = 1.5
			}
		}
	}
	trigger_if = {
		limit = {
			exists = scope:target
			scope:target = {
				tier = tier_duchy
			}
		}
		piety >= {
			value = medium_buy_claim_piety_value
			if = {
				limit = {
					government_has_mechanic = administrative
				}
				multiply = 1.5
			}
		}
	}
	trigger_if = {
		limit = {
			exists = scope:target
			scope:target = {
				tier = tier_kingdom
			}
		}
		piety >= {
			value = major_buy_claim_piety_value
			if = {
				limit = {
					government_has_mechanic = administrative
				}
				multiply = 1.5
			}
		}
	}
	trigger_if = {
		limit = {
			exists = scope:target
			scope:target = {
				tier = tier_empire
			}
		}
		piety >= {
			value = massive_buy_claim_piety_value
			if = {
				limit = {
					government_has_mechanic = administrative
				}
				multiply = 1.5
			}
		}
	}
	trigger_if = {
		limit = {
			exists = scope:target
			scope:target = {
				tier = tier_hegemony
			}
		}
		piety >= {
			value = monumental_buy_claim_piety_value
			if = {
				limit = {
					government_has_mechanic = administrative
				}
				multiply = 1.5
			}
		}
	}
}
scope:recipient = {
	NOT = {
		has_strong_hook = scope:puppet_or_actor
	}
}
tgp_blocked_action_against_tenno_trigger = {
	ACTOR = scope:puppet_or_actor
	TARGET = scope:recipient
}

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

on_accept = scope:puppet_or_actor = {
	send_interface_toast = {
		type = event_toast_effect_good
		title = buy_claim_interaction.message
		left_icon = scope:puppet_or_actor
		right_icon = scope:recipient
		add_piety = {
			value = 0
			if = {
				limit = {
					scope:target = {
						tier = tier_county
					}
				}
				add = minor_buy_claim_piety_loss
			}
			if = {
				limit = {
					scope:target = {
						tier = tier_duchy
					}
				}
				add = medium_buy_claim_piety_loss
			}
			if = {
				limit = {
					scope:target = {
						tier = tier_kingdom
					}
				}
				add = major_buy_claim_piety_loss
			}
			if = {
				limit = {
					scope:target = {
						tier = tier_empire
					}
				}
				add = massive_buy_claim_piety_loss
			}
			if = {
				limit = {
					scope:target = {
						tier = tier_hegemony
					}
				}
				add = monumental_buy_claim_piety_loss
			}
			if = {
				limit = {
					government_has_mechanic = administrative
				}
				multiply = 1.5
			}
		}
		add_unpressed_claim = scope:target
	}
	stress_and_fulfillment_impact = {
		just = medium_stress_impact_gain
		honest = medium_stress_impact_gain
	}
}
if = {
	limit = {
		scope:is_puppet_action ?= yes
		scope:actor != scope:recipient
	}
	scope:actor = {
		send_interface_toast = {
			type = event_toast_effect_good
			title = buy_claim_interaction.message_puppeteer
			left_icon = scope:puppet_or_actor
			right_icon = scope:recipient
		}
	}
}
scope:recipient = {
	add_opinion = {
		target = scope:puppet_or_actor
		modifier = claimed_my_title_opinion
		opinion = -60
	}
	trigger_event = perk_interaction.0002
}
add_clan_unity_interaction_effect = {
	CHARACTER = scope:puppet_or_actor
	TARGET = scope:recipient
	VALUE = minor_unity_loss
	DESC = clan_unity_bought_claim.desc
	REVERSE_NON_HOUSE_TARGET = no
}

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