Exact Tribute

is_shown = scope:recipient = {
	is_ai = yes
}
scope:actor = {
	OR = {
		highest_held_title_tier >= tier_hegemony
		AND = {
			government_has_flag = government_is_mandala
			scope:recipient = {
				is_tributary_of = scope:actor
			}
		}
	}
}

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

scope:recipient = {
	is_available_adult = yes
	custom_tooltip = {
		text = exact_tribute_interaction_recently_tribute_missioned_tt
		NOT = {
			var:tribute_mission_grace ?= scope:actor
		}
	}
	trigger_if = {
		limit = {
			scope:actor = {
				government_has_flag = government_is_mandala
			}
		}
		can_execute_decision = tribute_mission_decision_mandala
	}
	trigger_else_if = {
		limit = {
			scope:actor.primary_title = title:h_china
		}
		can_execute_decision = tribute_mission_decision_china
	}
	trigger_else_if = {
		limit = {
			scope:actor.primary_title = title:h_roman_empire
		}
		can_execute_decision = tribute_mission_decision_roman_empire
	}
	trigger_else_if = {
		limit = {
			scope:actor.primary_title = title:h_eastern_roman_empire
		}
		can_execute_decision = tribute_mission_decision_eastern_roman_empire
	}
	trigger_else_if = {
		limit = {
			scope:actor.primary_title = title:h_dar_al_islam
		}
		can_execute_decision = tribute_mission_decision_dar_al_islam
	}
	trigger_else_if = {
		limit = {
			scope:actor.primary_title = title:h_india
		}
		can_execute_decision = tribute_mission_decision_india
	}
	trigger_else = {
		always = no
	}
	trigger_if = {
		limit = {
			scope:actor = {
				highest_held_title_tier >= tier_hegemony
			}
		}
		scope:recipient = {
			trigger_if = {
				limit = {
					is_tributary_of = scope:actor
				}
				subject_standing < exact_tribute_subject_standing_value
			}
			trigger_else = {
				is_independent_ruler = yes
				highest_held_title_tier < tier_hegemony
				is_tributary = no
				custom_tooltip = {
					text = exact_tribute_interaction_hegemony_not_neighbor_tt
					any_neighboring_realm_with_tributaries_owner = {
						this = scope:actor
					}
				}
			}
		}
	}
	trigger_else = {
		scope:actor = {
			government_has_flag = government_is_mandala
		}
		scope:recipient = {
			is_tributary_of = scope:actor
		}
	}
	trigger_if = {
		limit = {
			NOR = {
				var:declined_requested_tribute_recently ?= scope:actor
				var:requested_tribute_mission ?= scope:actor
			}
		}
		custom_tooltip = {
			text = exact_tribute_interaction_no_tribute_tt
			OR = {
				tribute_mission_decision_generic_trigger = yes
				tribute_mission_decision_concubine_trigger = {
					OVERLORD = scope:actor
				}
				tribute_mission_decision_eunuch_trigger = {
					OVERLORD = scope:actor
				}
			}
		}
	}
	custom_tooltip = {
		text = exact_tribute_interaction_recently_refused_tt
		NOT = {
			var:declined_requested_tribute_recently ?= scope:actor
		}
	}
	custom_tooltip = {
		text = exact_tribute_interaction_already_engaged_tt
		NOR = {
			var:requested_tribute_mission ?= scope:actor
			has_variable = tribute_mission_type
		}
	}
}

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

on_accept = scope:actor = {
	if = {
		limit = {
			is_ai = no
		}
		trigger_event = tribute_mission.9010
	}
}
scope:recipient = {
	set_variable = {
		name = requested_tribute_mission
		value = scope:actor
		years = requested_tribute_mission_deadline_years
	}
	trigger_event = {
		id = tribute_mission.9500
		years = requested_tribute_mission_deadline_years
	}
	switch = {
		trigger = yes
		scope:gold ?= {
			set_variable = {
				name = requested_tribute_mission_type_gold
				years = requested_tribute_mission_deadline_years
			}
			custom_tooltip = exact_tribute_interaction_gold_tt
		}
		scope:herd ?= {
			set_variable = {
				name = requested_tribute_mission_type_herd
				years = requested_tribute_mission_deadline_years
			}
			custom_tooltip = exact_tribute_interaction_herd_tt
		}
		scope:artifact ?= {
			set_variable = {
				name = requested_tribute_mission_type_artifact
				years = requested_tribute_mission_deadline_years
			}
			custom_tooltip = exact_tribute_interaction_artifact_tt
			random_character_artifact = {
				limit = {
					is_suitable_artifact_tribute_trigger = yes
				}
				scope:recipient = {
					set_variable = {
						name = predetermined_artifact_tribute
						value = prev
					}
				}
			}
		}
		scope:concubine ?= {
			set_variable = {
				name = requested_tribute_mission_type_concubine
				years = requested_tribute_mission_deadline_years
			}
			custom_tooltip = exact_tribute_interaction_concubine_tt
			every_courtier_or_guest = {
				limit = {
					can_be_offered_as_concubine_to_character_trigger = {
						GIVER = scope:recipient
						CHARACTER = scope:actor
					}
					tribute_mission_is_available_concubine_trigger = yes
				}
				add_to_list = potential_concubine_tribute_list
				random_in_list = {
					list = potential_concubine_tribute_list
					weight = {
						base = 0
						modifier = {
							add = 10
							NOR = {
								is_councillor = yes
								has_any_court_position = yes
							}
						}
						modifier = {
							add = 5
							is_knight = no
						}
						modifier = {
							add = 20
							NOT = {
								exists = inspiration
							}
						}
						modifier = {
							add = 15
							NOT = {
								is_close_or_extended_family_of = scope:recipient
							}
						}
						modifier = {
							add = 20
							NOT = {
								has_relation_friend = scope:recipient
							}
						}
						modifier = {
							add = 25
							NOT = {
								is_child_of = scope:recipient
							}
						}
					}
					scope:recipient = {
						set_variable = {
							name = predetermined_concubine_tribute
							value = prev
						}
					}
				}
			}
		}
		scope:eunuch ?= {
			set_variable = {
				name = requested_tribute_mission_type_eunuch
				years = requested_tribute_mission_deadline_years
			}
			custom_tooltip = exact_tribute_interaction_eunuch_tt
			every_courtier = {
				limit = {
					tribute_mission_is_available_eunuch_trigger = yes
					NAND = {
						rite = {
							rite_has_doctrine = doctrine_theocracy_temporal
						}
						this = scope:actor.cp:councillor_court_chaplain
					}
					has_any_disease_trigger = no
				}
				add_to_list = potential_eunuch_tribute_list
				random_in_list = {
					list = potential_eunuch_tribute_list
					weight = {
						base = 0
						modifier = {
							add = 10
							NOR = {
								is_councillor = yes
								has_any_court_position = yes
							}
						}
						modifier = {
							add = 5
							is_knight = no
						}
						modifier = {
							add = 20
							NOT = {
								exists = inspiration
							}
						}
						modifier = {
							add = 15
							NOT = {
								is_close_or_extended_family_of = scope:recipient
							}
						}
						modifier = {
							add = 20
							NOT = {
								has_relation_friend = scope:recipient
							}
						}
						modifier = {
							add = 25
							NOT = {
								is_child_of = scope:recipient
							}
						}
					}
					scope:recipient = {
						set_variable = {
							name = predetermined_eunuch_tribute
							value = prev
						}
					}
				}
			}
		}
	}
	if = {
		limit = {
			scope:actor = {
				government_has_flag = government_is_mandala
			}
		}
		execute_decision = tribute_mission_decision_mandala
	}
	else_if = {
		limit = {
			scope:actor.primary_title = title:h_china
		}
		execute_decision = tribute_mission_decision_china
	}
	else_if = {
		limit = {
			scope:actor.primary_title = title:h_roman_empire
		}
		execute_decision = tribute_mission_decision_roman_empire
	}
	else_if = {
		limit = {
			scope:actor.primary_title = title:h_eastern_roman_empire
		}
		execute_decision = tribute_mission_decision_eastern_roman_empire
	}
	else_if = {
		limit = {
			scope:actor.primary_title = title:h_dar_al_islam
		}
		execute_decision = tribute_mission_decision_dar_al_islam
	}
	else_if = {
		limit = {
			scope:actor.primary_title = title:h_india
		}
		execute_decision = tribute_mission_decision_india
	}
}
on_decline = scope:recipient = {
	if = {
		limit = {
			has_legitimacy = yes
		}
		add_legitimacy = minor_legitima
# … (cut here; the rest is in the file)

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