Fixes for issue UnimplementedInterfaceMethod: Method getsupportedtypes is not defined

src/Api/ApigeeX/Denormalizer/AppGroupMembershipDenormalizer.php

@@ -61,4 +61,14 @@ public function supportsDenormalization($data, $type, $format = null)
 
         return AppGroupMembership::class === $type || $type instanceof AppGroupMembership;
     }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getSupportedTypes(?string $format): array
+    {
+        return [
+            AppGroupMembership::class => true,
+        ];
+    }
 }

src/Api/Management/Query/StatsQueryNormalizer.php

@@ -96,4 +96,14 @@ public function supportsNormalization($data, $format = null)
     {
         return $data instanceof StatsQuery;
     }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getSupportedTypes(?string $format): array
+    {
+        return [
+            StatsQuery::class => true,
+        ];
+    }
 }

src/Serializer/EntitySerializer.php

@@ -220,6 +220,16 @@ public function supportsEncoding($format): bool
         return $this->format === $format && $this->serializer->supportsEncoding($format);
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public function getSupportedTypes(?string $format): array
+    {
+        return [
+            EntitySerializerInterface::class => true,
+        ];
+    }
+
     /**
      * Allows subclasses to replace the default JSON encoder.
      *