I'd like to generate a PDF file strictly in the PDF/A1-a format (to integrate with a government service). This service does not support PDF/A1-b or PDF/A1-x format. Only PDF/A1-a.
Previously, I used mPDF (https://mpdf.github.io/) in my work. But this library supports maximum PDF/A1-b.
A search in Google gave no result. But I think that I am not the first one who needed this format. Please tell me if there is something convenient for working with this "rare" format (PDF/A1-a).
Regards, Alexey.