Varies from manufacturer to manufacturer. This is Ingenico's approach, for instance: https://ingenico.com/en/products-services/services/security-solutions/e-sig

Varies from manufacturer to manufacturer. This is Ingenico's approach, for instance: https://ingenico.com/en/products-services/services/security-solutions/e-sign https://ingenico.com/en/products-services/services/security-...