diff --git a/mod/lti/classes/local/ltiservice/service_base.php b/mod/lti/classes/local/ltiservice/service_base.php
index 9f45235c164..ecaf2c7f08c 100644
--- a/mod/lti/classes/local/ltiservice/service_base.php
+++ b/mod/lti/classes/local/ltiservice/service_base.php
@@ -353,6 +353,16 @@ abstract class service_base {
         return array();
     }
 
+    /**
+     * Return an array of key/claim mapping allowing LTI 1.1 custom parameters
+     * to be transformed to LTI 1.3 claims.
+     *
+     * @return array Key/value pairs of params to claim mapping.
+     */
+    public function get_jwt_claim_mappings(): array {
+        return array();
+    }
+
     /**
      * Get the path for service requests.
      *
diff --git a/mod/lti/locallib.php b/mod/lti/locallib.php
index b83b7c5909b..b1339a68152 100644
--- a/mod/lti/locallib.php
+++ b/mod/lti/locallib.php
@@ -126,7 +126,12 @@ function lti_get_jwt_message_type_mapping() {
  * @return array
  */
 function lti_get_jwt_claim_mapping() {
-    return array(
+    $mapping = [];
+    $services = lti_get_services();
+    foreach ($services as $service) {
+        $mapping = array_merge($mapping, $service->get_jwt_claim_mappings());
+    }
+    $mapping = array_merge($mapping, array(
         'accept_copy_advice' => [
             'suffix' => 'dl',
             'group' => 'deep_linking_settings',
@@ -443,74 +448,9 @@ function lti_get_jwt_claim_mapping() {
             'group' => 'tool_platform',
             'claim' => 'url',
             'isarray' => false
-        ],
-        'custom_context_memberships_v2_url' => [
-            'suffix' => 'nrps',
-            'group' => 'namesroleservice',
-            'claim' => 'context_memberships_url',
-            'isarray' => false
-        ],
-        'custom_context_memberships_versions' => [
-            'suffix' => 'nrps',
-            'group' => 'namesroleservice',
-            'claim' => 'service_versions',
-            'isarray' => true
-        ],
-        'custom_gradebookservices_scope' => [
-            'suffix' => 'ags',
-            'group' => 'endpoint',
-            'claim' => 'scope',
-            'isarray' => true
-        ],
-        'custom_lineitems_url' => [
-            'suffix' => 'ags',
-            'group' => 'endpoint',
-            'claim' => 'lineitems',
-            'isarray' => false
-        ],
-        'custom_lineitem_url' => [
-            'suffix' => 'ags',
-            'group' => 'endpoint',
-            'claim' => 'lineitem',
-            'isarray' => false
-        ],
-        'custom_results_url' => [
-            'suffix' => 'ags',
-            'group' => 'endpoint',
-            'claim' => 'results',
-            'isarray' => false
-        ],
-        'custom_result_url' => [
-            'suffix' => 'ags',
-            'group' => 'endpoint',
-            'claim' => 'result',
-            'isarray' => false
-        ],
-        'custom_scores_url' => [
-            'suffix' => 'ags',
-            'group' => 'endpoint',
-            'claim' => 'scores',
-            'isarray' => false
-        ],
-        'custom_score_url' => [
-            'suffix' => 'ags',
-            'group' => 'endpoint',
-            'claim' => 'score',
-            'isarray' => false
-        ],
-        'lis_outcome_service_url' => [
-            'suffix' => 'bo',
-            'group' => 'basicoutcome',
-            'claim' => 'lis_outcome_service_url',
-            'isarray' => false
-        ],
-        'lis_result_sourcedid' => [
-            'suffix' => 'bo',
-            'group' => 'basicoutcome',
-            'claim' => 'lis_result_sourcedid',
-            'isarray' => false
-        ],
-    );
+        ]
+    ));
+    return $mapping;
 }
 
 /**
diff --git a/mod/lti/service/basicoutcomes/classes/local/service/basicoutcomes.php b/mod/lti/service/basicoutcomes/classes/local/service/basicoutcomes.php
index bfc6420609a..d25d2e8f813 100644
--- a/mod/lti/service/basicoutcomes/classes/local/service/basicoutcomes.php
+++ b/mod/lti/service/basicoutcomes/classes/local/service/basicoutcomes.php
@@ -90,4 +90,25 @@ class basicoutcomes extends \mod_lti\local\ltiservice\service_base {
         return [self::SCOPE_BASIC_OUTCOMES];
     }
 
+    /**
+     * Return an array of key/claim mapping allowing LTI 1.1 custom parameters
+     * to be transformed to LTI 1.3 claims.
+     *
+     * @return array Key/value pairs of params to claim mapping.
+     */
+    public function get_jwt_claim_mappings(): array {
+        return array('lis_outcome_service_url' => [
+                'suffix' => 'bo',
+                'group' => 'basicoutcome',
+                'claim' => 'lis_outcome_service_url',
+                'isarray' => false
+            ],
+            'lis_result_sourcedid' => [
+                'suffix' => 'bo',
+                'group' => 'basicoutcome',
+                'claim' => 'lis_result_sourcedid',
+                'isarray' => false
+            ]);
+    }
+
 }
diff --git a/mod/lti/service/gradebookservices/classes/local/service/gradebookservices.php b/mod/lti/service/gradebookservices/classes/local/service/gradebookservices.php
index 3dc691e035b..12cb8b38b75 100644
--- a/mod/lti/service/gradebookservices/classes/local/service/gradebookservices.php
+++ b/mod/lti/service/gradebookservices/classes/local/service/gradebookservices.php
@@ -183,6 +183,58 @@ class gradebookservices extends service_base {
         return [$targetlinkuri, $customstr];
     }
 
+    /**
+     * Return an array of key/claim mapping allowing LTI 1.1 custom parameters
+     * to be transformed to LTI 1.3 claims.
+     *
+     * @return array Key/value pairs of params to claim mapping.
+     */
+    public function get_jwt_claim_mappings(): array {
+        return array('custom_gradebookservices_scope' => [
+            'suffix' => 'ags',
+            'group' => 'endpoint',
+            'claim' => 'scope',
+            'isarray' => true
+        ],
+        'custom_lineitems_url' => [
+            'suffix' => 'ags',
+            'group' => 'endpoint',
+            'claim' => 'lineitems',
+            'isarray' => false
+        ],
+        'custom_lineitem_url' => [
+            'suffix' => 'ags',
+            'group' => 'endpoint',
+            'claim' => 'lineitem',
+            'isarray' => false
+        ],
+        'custom_results_url' => [
+            'suffix' => 'ags',
+            'group' => 'endpoint',
+            'claim' => 'results',
+            'isarray' => false
+        ],
+        'custom_result_url' => [
+            'suffix' => 'ags',
+            'group' => 'endpoint',
+            'claim' => 'result',
+            'isarray' => false
+        ],
+        'custom_scores_url' => [
+            'suffix' => 'ags',
+            'group' => 'endpoint',
+            'claim' => 'scores',
+            'isarray' => false
+        ],
+        'custom_score_url' => [
+            'suffix' => 'ags',
+            'group' => 'endpoint',
+            'claim' => 'score',
+            'isarray' => false
+        ]);
+    }
+
+
     /**
      * Return an array of key/values to add to the launch parameters.
      *
diff --git a/mod/lti/service/memberships/classes/local/service/memberships.php b/mod/lti/service/memberships/classes/local/service/memberships.php
index 538c228786e..d9c747064c5 100644
--- a/mod/lti/service/memberships/classes/local/service/memberships.php
+++ b/mod/lti/service/memberships/classes/local/service/memberships.php
@@ -554,4 +554,24 @@ class memberships extends \mod_lti\local\ltiservice\service_base {
         return $launchparameters;
     }
 
+    /**
+     * Return an array of key/claim mapping allowing LTI 1.1 custom parameters
+     * to be transformed to LTI 1.3 claims.
+     *
+     * @return array Key/value pairs of params to claim mapping.
+     */
+    public function get_jwt_claim_mappings(): array {
+        return array('custom_context_memberships_v2_url' => [
+            'suffix' => 'nrps',
+            'group' => 'namesroleservice',
+            'claim' => 'context_memberships_url',
+            'isarray' => false
+            ],
+            'custom_context_memberships_versions' => [
+                'suffix' => 'nrps',
+                'group' => 'namesroleservice',
+                'claim' => 'service_versions',
+                'isarray' => true
+            ]);
+    }
 }
diff --git a/mod/lti/tests/locallib_test.php b/mod/lti/tests/locallib_test.php
index 83a39c066b3..3a04c21f6eb 100644
--- a/mod/lti/tests/locallib_test.php
+++ b/mod/lti/tests/locallib_test.php
@@ -1026,8 +1026,8 @@ class locallib_test extends mod_lti_testcase {
                 'isarray' => false
             ],
         ];
-
-        $this->assertEquals($mapping, lti_get_jwt_claim_mapping());
+        $actual = lti_get_jwt_claim_mapping();
+        $this->assertEquals($mapping, $actual);
     }
 
     /**
diff --git a/mod/lti/upgrade.txt b/mod/lti/upgrade.txt
index 503089d29f5..a6b71d25639 100644
--- a/mod/lti/upgrade.txt
+++ b/mod/lti/upgrade.txt
@@ -1,5 +1,10 @@
 This files describes API changes in the lti code.
 
+=== 4.1.2 ===
+
+* get_jwt_claim_mappings() function has been added to service_base class. It allows a service subplugin to be
+  compatible with LTI 1.3 by exposing its 1.1 custom parameters to LTI 1.3 claim mapping.
+
 === 4.1 ===
 
 * The callback get_shortcuts() is now removed. Please use get_course_content_items and get_all_content_items instead.