How send base64 image to front-end?

Hello!

I'm using Amplify + Aws Rekognition + FaceLiveness and i have a problem in this method:

GetFaceLivenessSessionResults

{
   "AuditImages": [ 
      { 
         "BoundingBox": { 
            "Height": number,
            "Left": number,
            "Top": number,
            "Width": number
         },
         "Bytes": blob,
         "S3Object": { 
            "Bucket": "string",
            "Name": "string",
            "Version": "string"
         }
      }
   ],
   "Confidence": number,
   "ReferenceImage": { 
      "BoundingBox": { 
         "Height": number,
         "Left": number,
         "Top": number,
         "Width": number
      },
      "Bytes": blob,
      "S3Object": { 
         "Bucket": "string",
         "Name": "string",
         "Version": "string"
      }
   },
   "SessionId": "string",
   "Status": "string"
}

Using the Amplify front+backend, i can just get the data correctly, but i'm using a back-end in Laravel and just using the components for Liveness Service in front-end.

This code below is my code to get the results of the LivenessSession, and when i send it to front-end, i have this error in ReferenceImage/Bytes key:

Malformed UTF-8 characters, possibly incorrectly encoded

    public function getResults($sessionId) {
        try {
            $client = new RekognitionClient([
                'region' => 'us-east-1',
                'version' => 'latest',
                'credentials' => [
                    'key' => env('AWS_ACCESS_KEY_ID'),
                    'secret' => env('AWS_SECRET_ACCESS_KEY')
                ]
            ]);

            $results = $client->getFaceLivenessSessionResults([
                'SessionId' => $sessionId
            ]);

            unset($results['@metadata']);
            unset($results['AuditImages']);


            return response()->json([
                'status' => 'success',
                'data' => $results->toArray()
            ]);

        } catch (AwsException $error) {
            return response()->json([
                'status' => 'error',
                'message' => 'AWS Error: ' . $error->getAwsErrorMessage()
            ], $error->getStatusCode());

        } catch (\Exception $error) {
            return response()->json([
                'status' => 'error',
                'message' => 'General Error: ' . $error->getMessage()
            ], 500);
        }
    }

This is the type of the key:

Bytes The Base64-encoded bytes representing an image selected from the Face Liveness video and returned for audit purposes.

Type: Base64-encoded binary data object

Length Constraints: Minimum length of 1. Maximum length of 204800.

Required: No

And i already used base64_encode, decode, utf8 encode and decode and don't can just send the image to the front-end, i really will be grateful if anyone help me! :)