GroupDocs.Signature for Python via .NET adds, searches, verifies, updates and deletes electronic signatures (text, image, digital, barCode, Qr Code, stamp, form-field and metadata) in PDF, Word, Excel, PowerPoint, OpenDocument and image files through one API....labelling : put barcodes and QR codes on invoices, shipping documents... image, digital, barcode, QR code, stamp, form-field, and metadata...