During July 2025, this developer enhanced cross-language document processing by implementing support for XML Proforma Invoices and XML Invoice Offers in the diadoc/diadocsdk-csharp repository, ensuring compliance with regulation 29. They updated protobuf definitions and generated code to enable seamless end-to-end handling of new document types across both C# and Java SDKs. In the diadoc/diadocsdk-java repository, they extended the DocumentTitleType enum to support the ProformaInvoice29 format, improving interoperability for invoicing systems. Their work focused on API integration, document formatting, and XML processing, providing regulatory-compliant solutions and reducing integration time for customers using either C# or Java.