net8.0 enable enable true DocumentOperator.API Digital Data GmbH Digital Data GmbH DocumentOperator.API 1.0.0 1.0.0.0 1.0.0.0 1.0.0 Copyright © 2026 Digital Data GmbH. All rights reserved. PDF Document Operations REST API - Validation, Swiss QR Code extraction, attachments, merge, annotation, stamp operations powered by DevExpress Office File API pdf document operator validation swiss-qr-code annotations stamp devexpress