diff --git a/lib/internal/Magento/Framework/Reflection/DataObjectProcessor.php b/lib/internal/Magento/Framework/Reflection/DataObjectProcessor.php
index 94023d129d1db..f6c0d540fa351 100644
--- a/lib/internal/Magento/Framework/Reflection/DataObjectProcessor.php
+++ b/lib/internal/Magento/Framework/Reflection/DataObjectProcessor.php
@@ -51,6 +51,11 @@ class DataObjectProcessor
      */
     private $excludedMethodsClassMap;
 
+    /**
+     * @var array[]
+     */
+    private $objectKeyMap;
+
     /**
      * @param MethodsMap $methodsMapProcessor
      * @param TypeCaster $typeCaster
@@ -59,6 +64,7 @@ class DataObjectProcessor
      * @param ExtensionAttributesProcessor $extensionAttributesProcessor
      * @param array $processors
      * @param array $excludedMethodsClassMap
+     * @param array $objectKeyMap
      */
     public function __construct(
         MethodsMap $methodsMapProcessor,
@@ -67,7 +73,8 @@ public function __construct(
         CustomAttributesProcessor $customAttributesProcessor,
         ExtensionAttributesProcessor $extensionAttributesProcessor,
         array $processors = [],
-        array $excludedMethodsClassMap = []
+        array $excludedMethodsClassMap = [],
+        array $objectKeyMap = []
     ) {
         $this->methodsMapProcessor = $methodsMapProcessor;
         $this->typeCaster = $typeCaster;
@@ -76,6 +83,7 @@ public function __construct(
         $this->customAttributesProcessor = $customAttributesProcessor;
         $this->processors = $processors;
         $this->excludedMethodsClassMap = $excludedMethodsClassMap;
+        $this->objectKeyMap = $objectKeyMap;
     }
 
     /**
@@ -143,7 +151,7 @@ public function buildOutputDataArray($dataObject, $dataObjectType)
                 }
             }
 
-            $outputData[$key] = $value;
+            $outputData[$this->getKeyByObjectType($key, $dataObjectType)] = $value;
         }
 
         $outputData = $this->changeOutputArray($dataObject, $outputData);
@@ -168,4 +176,22 @@ private function changeOutputArray($dataObject, array $outputData): array
 
         return $outputData;
     }
+
+    /**
+     * Mapping argument processor to modify output api key
+     *
+     * @param string $key
+     * @param string $dataObjectType
+     * @return string
+     */
+    private function getKeyByObjectType(string $key, string $dataObjectType): string
+    {
+        $dataObjectType = ltrim($dataObjectType, '\\');
+        if (array_key_exists($dataObjectType, $this->objectKeyMap) &&
+            array_key_exists($key, $this->objectKeyMap[$dataObjectType])
+        ) {
+            $key = $this->objectKeyMap[$dataObjectType][$key];
+        }
+        return $key;
+    }
 }
diff --git a/lib/internal/Magento/Framework/Reflection/Test/Unit/DataObjectProcessorTest.php b/lib/internal/Magento/Framework/Reflection/Test/Unit/DataObjectProcessorTest.php
index 1510c6aee4cdb..a751d1e61c53b 100644
--- a/lib/internal/Magento/Framework/Reflection/Test/Unit/DataObjectProcessorTest.php
+++ b/lib/internal/Magento/Framework/Reflection/Test/Unit/DataObjectProcessorTest.php
@@ -76,6 +76,12 @@ public function testBuildOutputDataArray(
     ) {
         $objectManager = new ObjectManager($this);
 
+        $objectKeyMap = [
+            TestDataInterface::class => [
+                'required_billing' => 'requiredBilling'
+            ],
+        ];
+
         $this->dataObjectProcessor = $objectManager->getObject(
             DataObjectProcessor::class,
             [
@@ -84,6 +90,7 @@ public function testBuildOutputDataArray(
                 'fieldNamer' => $objectManager->getObject(FieldNamer::class),
                 'extensionAttributesProcessor' => $this->extensionAttributesProcessorMock,
                 'excludedMethodsClassMap' => $excludedMethodsClassMap,
+                'objectKeyMap' => $objectKeyMap,
             ]
         );
 
@@ -121,7 +128,7 @@ public static function buildOutputDataArrayDataProvider()
             'id' => '1',
             'address' => 'someAddress',
             'default_shipping' => 'true',
-            'required_billing' => 'false',
+            'requiredBilling' => 'false'
         ];
 
         $extensionAttributes = [