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After upgraded plugin to version 4.7.0 i begun receiving following fatal errors.
Argument 1 passed to GuzzleHttp\Client::send() must be an instance of GuzzleHttp\Message\RequestInterface, instance of GuzzleHttp\Psr7\Request given, called in /var/www/[...]/paapi5-php-sdk/src/com/amazon/paapi5/v1/api/DefaultApi.php on line 422 and defined in /var/www/[...]/plugins/cloudflare/vendor/guzzlehttp/guzzle/src/Client.php:158
Downgraded to version 4.6.0 solved the problem