diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7623a26..2b2b357 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ before starting to add changes. Use example [placed in the end of the page](#exa
 ## [Unreleased]
 
 - Added webform ID to digital post audit logging messages.
+- Added audit logging to `os2forms_fasit`
 
 ## [3.19.0] 2024-12-06
 
diff --git a/modules/os2forms_fasit/os2forms_fasit.info.yml b/modules/os2forms_fasit/os2forms_fasit.info.yml
index 0142493..43309b4 100644
--- a/modules/os2forms_fasit/os2forms_fasit.info.yml
+++ b/modules/os2forms_fasit/os2forms_fasit.info.yml
@@ -7,4 +7,5 @@ dependencies:
   - drupal:webform
   - drupal:advancedqueue
   - os2forms:os2forms_attachment
+  - os2web:os2web_audit
 configure: os2forms_fasit.admin.settings
diff --git a/modules/os2forms_fasit/os2forms_fasit.services.yml b/modules/os2forms_fasit/os2forms_fasit.services.yml
index 23e41d4..4397c83 100644
--- a/modules/os2forms_fasit/os2forms_fasit.services.yml
+++ b/modules/os2forms_fasit/os2forms_fasit.services.yml
@@ -13,3 +13,4 @@ services:
       - '@entity_type.manager'
       - "@Drupal\\os2forms_fasit\\Helper\\Settings"
       - "@Drupal\\os2forms_fasit\\Helper\\CertificateLocatorHelper"
+      - "@os2web_audit.logger"
diff --git a/modules/os2forms_fasit/src/Helper/FasitHelper.php b/modules/os2forms_fasit/src/Helper/FasitHelper.php
index fb14351..fb1b686 100644
--- a/modules/os2forms_fasit/src/Helper/FasitHelper.php
+++ b/modules/os2forms_fasit/src/Helper/FasitHelper.php
@@ -11,6 +11,7 @@
 use Drupal\os2forms_fasit\Exception\InvalidSettingException;
 use Drupal\os2forms_fasit\Exception\InvalidSubmissionException;
 use Drupal\os2forms_fasit\Plugin\WebformHandler\FasitWebformHandler;
+use Drupal\os2web_audit\Service\Logger;
 use Drupal\webform\Entity\WebformSubmission;
 use GuzzleHttp\ClientInterface;
 use GuzzleHttp\Exception\GuzzleException;
@@ -33,7 +34,13 @@ class FasitHelper {
     'managed_file',
   ];
 
-  public function __construct(private readonly ClientInterface $client, private readonly EntityTypeManagerInterface $entityTypeManager, private readonly Settings $settings, private readonly CertificateLocatorHelper $certificateLocator) {
+  public function __construct(
+      private readonly ClientInterface $client,
+      private readonly EntityTypeManagerInterface $entityTypeManager,
+      private readonly Settings $settings,
+      private readonly CertificateLocatorHelper $certificateLocator,
+      private readonly Logger $auditLogger,
+  ) {
   }
 
   /**
@@ -231,6 +238,9 @@ private function uploadDocument(array $uploads, string $submissionId, array $han
     if (Response::HTTP_OK !== $response->getStatusCode()) {
       throw new FasitResponseException(sprintf('Expected status code 200, received %d', $response->getStatusCode()));
     }
+
+    $msg = sprintf('Successfully uploaded document %s to cpr %s in Fasit. Webform id: %s', $fasitDocumentTitle, $fasitCpr, $submission->getWebform()->id());
+    $this->auditLogger->info('Fasit', $msg);
   }
 
   /**
@@ -307,7 +317,7 @@ private function uploadAttachment(string $submissionId, array $handlerConfigurat
     $tempAttachmentFilename = tempnam(sys_get_temp_dir(), 'attachment');
     file_put_contents($tempAttachmentFilename, $fileContent);
 
-    return $this->uploadFile($fileName, $tempAttachmentFilename);
+    return $this->uploadFile($fileName, $tempAttachmentFilename, $submission->getWebform()->id());
   }
 
   /**
@@ -317,7 +327,9 @@ private function uploadAttachment(string $submissionId, array $handlerConfigurat
    *   The original filename.
    * @param string $tempFilename
    *   The temp filename.
-   *
+   * @param string $webformId
+   *   The webform id.
+ *
    * @throws \Drupal\os2forms_fasit\Exception\CertificateLocatorException
    *   Certificate locator exception.
    * @throws \Drupal\os2forms_fasit\Exception\FasitResponseException
@@ -325,7 +337,7 @@ private function uploadAttachment(string $submissionId, array $handlerConfigurat
    *
    * @phpstan-return array<string, mixed>
    */
-  private function uploadFile(string $originalFilename, string $tempFilename): array {
+  private function uploadFile(string $originalFilename, string $tempFilename, string $webformId): array {
     $endpoint = sprintf('%s/%s/%s/documents/%s',
       $this->settings->getFasitApiBaseUrl(),
       $this->settings->getFasitApiTenant(),
@@ -371,6 +383,11 @@ private function uploadFile(string $originalFilename, string $tempFilename): arr
       throw new FasitResponseException('Could not get upload id from response');
     }
 
+    // Note, that this does not mean a document has been sent to a citizen case in Fasit yet.
+    // This is done later by uploadDocument. The file has simply been made ready.
+    $msg = sprintf('Successfully uploaded file %s to Fasit. Webform id: %s', $originalFilename, $webformId);
+    $this->auditLogger->info('Fasit', $msg);
+
     return ['filename' => $originalFilename, 'id' => $content['id']];
   }
 
@@ -392,6 +409,7 @@ private function uploadFileElements(string $submissionId): array {
     // Fetch element ids that may contain pdf files.
     /** @var \Drupal\webform\Entity\WebformSubmission $submission */
     $submission = $this->getSubmission($submissionId);
+    $webformId = $submission->getWebform()->id();
     $fileIds = $this->getFileElementKeysFromSubmission($submission);
     $fileStorage = $this->entityTypeManager->getStorage('file');
 
@@ -412,7 +430,7 @@ private function uploadFileElements(string $submissionId): array {
       $tempFilename = tempnam(sys_get_temp_dir(), 'attachment');
       file_put_contents($tempFilename, $fileContent);
 
-      $uploads[] = $this->uploadFile($filename, $tempFilename);
+      $uploads[] = $this->uploadFile($filename, $tempFilename, $webformId);
     }
 
     return $uploads;