PdfSign.pkcs7 constructor Null safety

PdfSign.pkcs7(
  1. PdfPkcs7Signer signer,
  2. {String? name,
  3. String? location,
  4. String? reason,
  5. String? contactInfo,
  6. PdfSignPerms? permissions,
  7. int reservedSpace = 10000}
)

Digitally Sign a document using an external pkcs7 signature