sign
Applies an invisible digital signature to a document. An invisible signature adds cryptographic proof of authenticity without any visual representation on the document pages. The signature can be verified in PDF viewers that support digital signatures. If the document is not in PDF format and implicit conversion is enabled in the document settings, it will be automatically converted to PDF before signing.
Parameters
document
The document to sign.
output
The path where the signed PDF will be saved.
options
The digital signature options including certificate and metadata.