Simple app for creating, managing and exporting XRechnung XML and ZUGFeRD PDF invoices (German e-invoicing standard): - Simple WYSIWYG PDF designer (custom font, SVG logo, custom help lines, envelope window, folding marks) - Duplicate invoices or create from templates - Swagger API documentation - Multi language support - XRechnung 3.0 compliant XML - ZUGFeRD 2.1 compliant PDF (with embedded XML)