google-cloud-php Document AI: INVALID_ARGUMENT - google-api

Question

I am trying to use google-cloud-php to send documents to Google Document AI for processing.
Here is an example of my code:
require 'vendor/autoload.php';
putenv('GOOGLE_APPLICATION_CREDENTIALS=[###].json');
use Google\Cloud\DocumentAI\V1\Document;
use Google\Cloud\DocumentAI\V1\DocumentProcessorServiceClient;
$document = array();
$document['mime_type'] = 'application/pdf';
$document['content'] = file_get_contents('file.pdf');
$inlineDocument = new Document($document);
$postBody = array();
$postBody['inlineDocument'] = $inlineDocument;
$postBody['skipHumanReview'] = true;
$documentProcessorServiceClient = new DocumentProcessorServiceClient();
$formattedName = $documentProcessorServiceClient->processorName('[###]', 'eu', '[###]');
$operationResponse = $documentProcessorServiceClient->processDocument($formattedName, $postBody);
I am passing my arguments according to following documents:
processDocument Documentation
Document Documentation
However, I get the following response:
Fatal error: Uncaught Google\ApiCore\ApiException: { "message": "Request contains an invalid argument.", "code": 3, "status": "INVALID_ARGUMENT", "details": [] } thrown in \vendor\google\gax\src\ApiException.php on line 139
For some reason, the following document mentions to pass one argument as "mimeType" instead of "mime_type" compared to the previous link:
https://cloud.google.com/document-ai/docs/send-request
I tried that as well but that throws an exception in the php class.
Any help would be greatly appreciated!

Answer 1

I was running into the same issue, the problem is when other region than 'us'. If so, you should specify the apiEndpoint:
$documentProcessorServiceClient = new DocumentProcessorServiceClient([
'apiEndpoint' => 'eu-documentai.googleapis.com'
]);