Undocumented unless you signed a developer NDA for the target platform.
All of this info has been researched without any official documentation.
switch_accounts_close_userswitch_accounts_get_accountsswitch_accounts_get_handleswitch_accounts_get_netidswitch_accounts_get_nicknameswitch_accounts_get_online_tokenswitch_accounts_is_user_onlineswitch_accounts_is_user_openswitch_accounts_login_userswitch_accounts_network_service_availableswitch_accounts_open_preselected_userswitch_accounts_open_userswitch_accounts_select_accountswitch_add_ssl_certificateswitch_bnvib_get_lengthswitch_bnvib_get_loop_end_positionswitch_bnvib_get_loop_intervalswitch_bnvib_get_loop_start_positionswitch_bnvib_get_sampling_rateswitch_bnvib_get_valueswitch_bnvib_is_loopingswitch_bnvib_loadswitch_bnvib_unloadswitch_check_profanityswitch_controller_accelerationswitch_controller_angleswitch_controller_angular_velocityswitch_controller_directionswitch_controller_enable_sensor_fusionswitch_controller_get_default_joycon_assignmentswitch_controller_get_gyro_zero_drift_modeswitch_controller_get_handheld_activation_modeswitch_controller_get_sensor_fusion_paramsswitch_controller_get_sixaxis_handle_countswitch_controller_get_supported_stylesswitch_controller_is_at_restswitch_controller_is_sensor_fusion_enabledswitch_controller_joycon_get_holdtypeswitch_controller_joycon_left_connectedswitch_controller_joycon_right_connectedswitch_controller_joycon_set_holdtypeswitch_controller_reset_sensor_fusion_paramsswitch_controller_set_default_joycon_assignmentswitch_controller_set_gyro_zero_drift_modeswitch_controller_set_handheld_activation_modeswitch_controller_set_sensor_fusion_paramsswitch_controller_set_supported_stylesswitch_controller_show_strap_guideswitch_controller_start_lr_assignmentswitch_controller_stop_lr_assignmentswitch_controller_support_get_player_countswitch_controller_support_get_selected_idswitch_controller_support_set_allswitch_controller_support_set_defaultsswitch_controller_support_set_explain_textswitch_controller_support_set_identification_colorswitch_controller_support_set_identification_colourswitch_controller_support_set_left_justifyswitch_controller_support_set_maintain_connectionsswitch_controller_support_set_permit_joycon_dualswitch_controller_support_set_player_maxswitch_controller_support_set_player_minswitch_controller_support_set_show_explain_textswitch_controller_support_set_show_identification_colorsswitch_controller_support_set_show_identification_coloursswitch_controller_support_set_singleplayer_onlyswitch_controller_support_showswitch_controller_vibrate_hdswitch_controller_vibration_permittedswitch_error_beginswitch_error_endswitch_error_get_os_code_infoswitch_error_set_application_codeswitch_error_set_dialog_messageswitch_error_set_fullscreen_messageswitch_error_set_language_codeswitch_error_show_os_codeswitch_free_communication_availableswitch_free_communication_endswitch_free_communication_startswitch_gameserver_login_userswitch_gameserver_logout_userswitch_get_operation_modeswitch_get_performance_configswitch_get_performance_modeswitch_irsensor_cluster_config_set_defaultsswitch_irsensor_cluster_config_set_external_light_filteringswitch_irsensor_cluster_config_set_object_intensity_minswitch_irsensor_cluster_config_set_object_pixel_count_maxswitch_irsensor_cluster_config_set_object_pixel_count_minswitch_irsensor_cluster_config_set_window_of_interestswitch_irsensor_cluster_create_state_bufferswitch_irsensor_common_config_is_negative_image_usedswitch_irsensor_common_config_set_allswitch_irsensor_common_config_set_exposure_timeswitch_irsensor_common_config_set_gainswitch_irsensor_common_config_set_light_targetswitch_irsensor_get_modeswitch_irsensor_hand_config_set_modeswitch_irsensor_hand_create_state_buffersswitch_irsensor_image_config_set_defaultsswitch_irsensor_image_config_set_external_light_filteringswitch_irsensor_image_config_set_formatswitch_irsensor_image_config_set_orig_formatswitch_irsensor_image_config_set_trimming_formatswitch_irsensor_image_config_set_trimming_startswitch_irsensor_image_create_state_buffersswitch_irsensor_moment_config_set_defaultsswitch_irsensor_moment_config_set_preprocess_intensity_thresholdswitch_irsensor_moment_config_set_preprocessswitch_irsensor_moment_config_set_window_of_interestswitch_irsensor_moment_create_state_bufferswitch_irsensor_set_modeswitch_language_get_desired_languageswitch_leaderboard_get_scoresswitch_leaderboard_post_common_dataswitch_leaderboard_post_scoreswitch_mask_profanityswitch_matchmaking_session_autojoinswitch_matchmaking_session_close_participationswitch_matchmaking_session_createswitch_matchmaking_session_findswitch_matchmaking_session_joinswitch_matchmaking_session_leaveswitch_matchmaking_session_open_participationswitch_matchmaking_session_update_descriptionswitch_matchmaking_startswitch_matchmaking_stopswitch_mount_aoc_contentswitch_npln_leaderboard_delete_scoreswitch_npln_leaderboard_get_scores_near_userswitch_npln_leaderboard_get_scores_nearswitch_npln_leaderboard_get_scores_of_friendsswitch_npln_leaderboard_get_scores_of_usersswitch_npln_leaderboard_get_scores_rangeswitch_npln_leaderboard_get_user_dataswitch_npln_leaderboard_set_scoreswitch_npln_leaderboard_set_user_dataswitch_npln_login_prearranged_userswitch_npln_session_create_aliasswitch_npln_session_createswitch_npln_session_destroyswitch_npln_session_findswitch_npln_session_join_aliasswitch_npln_session_joinswitch_npln_session_matchmakeswitch_npln_session_send_dataswitch_npln_session_send_reliableswitch_npln_session_stream_closeswitch_npln_session_stream_openswitch_npln_session_stream_sendswitch_npln_session_updateswitch_query_storeswitch_recording_disableswitch_recording_enableswitch_save_data_commitswitch_save_data_mountswitch_save_data_unmountswitch_screenshot_disableswitch_screenshot_enableswitch_screenshot_set_orientationswitch_set_cpu_boost_modeswitch_set_local_network_modeswitch_set_net_autoconnectswitch_set_performance_configswitch_show_store_aoc_listswitch_show_store_product_detailsswitch_show_storeswitch_theme_set
ps4_gamepad_reset_colorps4_gamepad_reset_colourps4_share_screenshot_enableps4_share_video_enableps4_touchpad_mouse_enableps5_gamepad_get_trigger_effect_stateps5_gamepad_reset_colorps5_gamepad_reset_colourps5_gamepad_set_trigger_effect_feedbackps5_gamepad_set_trigger_effect_offps5_gamepad_set_trigger_effect_vibrationps5_gamepad_set_trigger_effect_weaponps5_gamepad_set_vibration_modeps5_get_game_presetsps5_set_high_frame_rateps5_share_features_disableps5_share_features_enableps5_touchpad_mouse_enablepsn_account_id_for_padpsn_addcont_mountpsn_addcont_unmountpsn_age_level_for_padpsn_check_np_availabilitypsn_communication_restriction_statuspsn_content_restriction_addpsn_country_for_userpsn_default_user_namepsn_default_userpsn_delete_tus_datapsn_disable_notice_screen_skip_flag_auto_setpsn_exit_np_libspsn_get_avatar_urlpsn_get_entitlement_listpsn_get_friends_scorespsn_get_leaderboard_score_rangepsn_get_leaderboard_scorepsn_get_trophy_unlock_statepsn_get_tus_datapsn_get_tus_variablepsn_init_leaderboardpsn_init_np_libspsn_init_trophypsn_load_modulespsn_mask_profanitypsn_matchmaking_create_game_sessionpsn_name_for_padpsn_name_for_userpsn_notice_screen_skip_flagpsn_np_check_pluspsn_np_commerce_dialog_open_on_productpsn_np_commerce_dialog_openpsn_np_commerce_dialog_tickpsn_np_notify_plus_featurepsn_np_statuspsn_post_leaderboard_score_commentpsn_post_leaderboard_scorepsn_post_uds_eventpsn_save_data_backuppsn_set_content_restrictionpsn_set_notice_screen_skip_flagpsn_set_tus_datapsn_set_tus_variablepsn_show_error_dialogpsn_tick_error_dialogpsn_tickpsn_unlock_trophypsn_user_for_padpsn_webapi_request
xboxlive_achievement_load_friendsxboxlive_achievement_load_leaderboardxboxlive_achievement_show_achievementsxboxlive_achievements_set_progressxboxlive_agegroup_for_userxboxlive_appdisplayname_for_userxboxlive_chat_add_user_to_channelxboxlive_chat_add_userxboxlive_chat_get_mutedxboxlive_chat_remove_user_from_channelxboxlive_chat_remove_userxboxlive_chat_set_communication_relationshipxboxlive_chat_set_mutedxboxlive_fire_eventxboxlive_gamedisplayname_for_userxboxlive_gamerscore_for_userxboxlive_gamertag_for_userxboxlive_generate_player_session_idxboxlive_get_achievementxboxlive_get_achievementsxboxlive_get_activating_userxboxlive_get_file_errorxboxlive_get_savedata_userxboxlive_get_stats_for_userxboxlive_get_store_idxboxlive_get_token_and_signaturexboxlive_get_user_countxboxlive_get_userxboxlive_matchmaking_createxboxlive_matchmaking_findxboxlive_matchmaking_join_invitexboxlive_matchmaking_join_sessionxboxlive_matchmaking_send_invitesxboxlive_matchmaking_session_get_usersxboxlive_matchmaking_session_leavexboxlive_matchmaking_set_find_timeoutxboxlive_matchmaking_set_joinable_sessionxboxlive_matchmaking_startxboxlive_matchmaking_stopxboxlive_pad_count_for_userxboxlive_pad_for_userxboxlive_read_player_leaderboardxboxlive_reputation_for_userxboxlive_set_rich_presencexboxlive_set_savedata_userxboxlive_set_service_configuration_idxboxlive_show_account_pickerxboxlive_show_profile_card_for_userxboxlive_sponsor_for_userxboxlive_sprite_add_from_gamerpicturexboxlive_stats_add_userxboxlive_stats_delete_statxboxlive_stats_flush_userxboxlive_stats_get_leaderboardxboxlive_stats_get_social_leaderboardxboxlive_stats_get_stat_namesxboxlive_stats_get_statxboxlive_stats_remove_userxboxlive_stats_set_stat_intxboxlive_stats_set_stat_realxboxlive_stats_set_stat_stringxboxlive_stats_setupxboxlive_user_for_padxboxlive_user_id_for_userxboxlive_user_is_activexboxlive_user_is_guestxboxlive_user_is_remotexboxlive_user_is_signed_inxboxlive_user_is_signing_inxboxlive_verify_string_asyncxboxone_achievements_set_progressxboxone_agegroup_for_userxboxone_appdisplayname_for_userxboxone_chat_add_user_to_channelxboxone_chat_add_userxboxone_chat_get_mutedxboxone_chat_remove_user_from_channelxboxone_chat_remove_userxboxone_chat_set_communication_relationshipxboxone_chat_set_mutedxboxone_check_privilegexboxone_classic_gamertag_for_userxboxone_find_controller_for_userxboxone_fire_eventxboxone_gamedisplayname_for_userxboxone_gamerscore_for_userxboxone_generate_player_session_idxboxone_get_achievementxboxone_get_achievementsxboxone_get_activating_userxboxone_get_file_errorxboxone_get_savedata_userxboxone_get_stats_for_userxboxone_get_user_countxboxone_get_userxboxone_is_constrainedxboxone_is_suspendingxboxone_license_trial_time_remainingxboxone_license_trial_userxboxone_license_trial_versionxboxone_matchmaking_createxboxone_matchmaking_findxboxone_matchmaking_join_invitexboxone_matchmaking_join_sessionxboxone_matchmaking_send_invitesxboxone_matchmaking_session_get_usersxboxone_matchmaking_session_leavexboxone_matchmaking_set_find_timeoutxboxone_matchmaking_set_joinable_sessionxboxone_matchmaking_startxboxone_matchmaking_stopxboxone_modern_gamertag_for_userxboxone_modern_gamertag_suffix_for_userxboxone_package_check_licensexboxone_pad_count_for_userxboxone_pad_for_userxboxone_read_player_leaderboardxboxone_reputation_for_userxboxone_set_rich_presencexboxone_set_savedata_userxboxone_set_savedata_uwp_compatibilityxboxone_set_service_configuration_idxboxone_show_account_pickerxboxone_show_helpxboxone_show_profile_card_for_userxboxone_sponsor_for_userxboxone_sprite_add_from_gamerpicturexboxone_stats_add_userxboxone_stats_delete_statxboxone_stats_flush_userxboxone_stats_get_leaderboardxboxone_stats_get_social_leaderboardxboxone_stats_get_stat_namesxboxone_stats_get_statxboxone_stats_remove_userxboxone_stats_set_stat_intxboxone_stats_set_stat_realxboxone_stats_set_stat_stringxboxone_stats_setupxboxone_streaming_get_infoxboxone_streaming_get_show_controlsxboxone_streaming_is_enabledxboxone_streaming_set_show_controlsxboxone_suspendxboxone_unique_modern_gamertag_for_userxboxone_update_recent_playersxboxone_user_for_padxboxone_user_id_for_userxboxone_user_is_activexboxone_user_is_guestxboxone_user_is_remotexboxone_user_is_signed_inxboxone_verify_string_asyncxboxone_was_terminatedxboxseriesxs_get_high_frame_ratexboxseriesxs_set_high_frame_ratexboxseriesxs_supports_high_frame_rate