Sign documents (invoices, contracts, etc..) using any standard certificate.
What is a digital signature?
The digital signature is simply a sequence of characters that is appended to the end of the body of a message to be transmitted under signature. It gives us the opportunity to inform, to faith and / or express a willingness in full legal compliance and security, without the need to be present for stamping on paper our handwritten signature.
What are the advantages provided by the Digital Signature?
How much can I save implementing the Digital Signature?
The monetary benefits of using Digital Signature solutions instead of traditional paper signs are:

Signature vs Digital Signatures Ink on Paper