Years ago I needed to programmatically fill PDFs and used this library to achieve it. Funny it has the same name as what you linked: https://www.pdflib.com/ htt

Years ago I needed to programmatically fill PDFs and used this library to achieve it. Funny it has the same name as what you linked: https://www.pdflib.com/ https://www.pdflib.com/ It is a paid commercial product however.