Learned that I should not refer to env vars directly so I removed all references.

app/Import/Prerequisites/BunqPrerequisites.php

@@ -156,7 +156,7 @@ class BunqPrerequisites implements PrerequisitesInterface
      */
     private function getBunqEnvironment(): BunqEnumApiEnvironmentType
     {
-        $env = env('BUNQ_USE_SANDBOX');
+        $env = config('firefly.bunq_use_sandbox');
         if (null === $env) {
             return BunqEnumApiEnvironmentType::PRODUCTION();
         }

app/Import/Storage/ImportArrayStorage.php

@@ -337,7 +337,7 @@ class ImportArrayStorage
             'description' => null,
             'latitude'    => null,
             'longitude'   => null,
-            'zoomLevel'   => null,
+            'zoom_level'   => null,
             'tagMode'     => 'nothing',
         ];
         $tag  = $repository->store($data);