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This files describes API changes in the lti code.

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=== 3.10 ===

* Select Content supports multiple, allowing a tool to return more than one link at a time.
  Parameter multiple in function lti_build_content_item_selection_request() is now set to true.
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* Deprecated unused function after external function, 'get_tool_proxies()', was refactored:
    - serialise_tool_proxy()
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=== 3.8 ===

* The following functions have been finally deprecated and can not be used anymore:
    * lti_scale_used()

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=== 3.7 ===

* Deprecated functions to add support for LTI 1 tools to access services:
    - mod_lti\local\ltiservice\service_base->check_tool_proxy()
    - mod_lti\local\ltiservice\service_base->check_type()
    - mod_lti\local\ltiservice\resource_base->check_tool_proxy()
    - mod_lti\local\ltiservice\resource_base->check_type()
    - mod_lti_edit_types_form->get_lti_advantage_services()
  replaced by:
    - mod_lti\local\ltiservice\service_base->check_tool()
    - mod_lti\local\ltiservice\resource_base->check_tool()
    - mod_lti_edit_types_form->get_lti_services()
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* Deprecated unused function:
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    - mod_lti\local\ltiservice\service_base->get_configuration_parameter_names()
* Deprecated functions to simplify implementation of LTI scopes for accessing services:
    - mod_lti\local\ltiservice\resource_base->get_permissions()
    - ltiservice_gradebookservices\local\resources\lineitem\get_permissions()
    - ltiservice_gradebookservices\local\resources\lineitems\get_permissions()
    - ltiservice_gradebookservices\local\resources\results\get_permissions()
    - ltiservice_gradebookservices\local\resources\scores\get_permissions()
    - ltiservice_memberships\local\resources\contextmemberships\get_permissions()
    replaced by:
    - mod_lti\local\ltiservice\service_base->get_permitted_scopes()
    - ltiservice_gradebookservices\local\service\gradebookservices->get_permitted_scopes()
    - ltiservice_memberships\local\service\memberships\->get_permitted_scopes()
* Deprecated function to remove definition as static:
    - ltiservice_memberships\local\service\memberships\get_users_json()
    replaced by:
    - ltiservice_memberships\local\service\memberships\get_members_json()

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=== 3.4 ===

* The following functions, previously used (exclusively) by upgrade steps are not available
  anymore because of the upgrade cleanup performed for this version. See MDL-57432 for more info:
    - mod_lti_upgrade_custom_separator()

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=== 3.2 ===

* Support for LTI ContentItem message type.
* New function lti_build_content_item_selection_request() for building an LTI ContentItemSelectionRequest.
* New Select content button in External tool configuration page that lets the user configure an external tool by fetching tool
  configuration content from the preconfigured tool's content selection interface.

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=== 3.1 ===

* When requesting a grade from the outcome service, and empty grade will now be returned as
  an empty grade in accordance with the spec. Previously a grade of 0 would be returned.

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=== 3.0 ===

* Function lti_view (locallib.php) was renamed to lti_launch_tool.
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  A new and different lti_view function was created in the module lib.php containing the code
  for launching events and update the completion status for the module.
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=== 2.8 ===

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* Support for LTI 2 added, including extensible services implemented as ltiservice plugins.
* Function sendOAuthBodyPOST removed from OAuthBody.php because it was not being used.
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* The field 'grade' in the table {lti} is now an integer rather than a numeric to bring it
  in line with the 'grade' field in other activities.

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=== 2.7 ===

* mod_lti\event\unknown_service_api_called now has less data stored in 'other'
  but everything is still available for event observers via method get_message_data()