Digital signatures are the online equivalent of a handwritten signature — they give merchants a way to authenticate a consumer and strengthen the evidence available if a transaction is later disputed.
How it works
At checkout, the consumer signs using an electronic pen, a mouse, or a tablet. That signature is captured as an encrypted image and sent to the merchant for verification and authentication.
Advantages
- Serves as legal documentation that a transaction actually took place
- Authenticates the source of the message it's attached to
- Encryption means a modified message invalidates the signature outright
- Genuinely harder to forge than a handwritten signature
What it doesn't solve
It requires hardware the consumer may not have. Critically, a digital signature does not prove the person signing is actually who they claim to be — it proves a signature was captured, not identity. It also can't guarantee a document's actual signing date without added time-stamping, the public key infrastructure behind it is expensive to build and maintain, and a compromised private key undermines the whole non-repudiation argument.
In practice
Integrate a third-party solution rather than building this in-house — DocuSign is a common choice. Whether a digital signature actually helps win a chargeback dispute depends on regional law, how the issuing bank interprets the evidence, and whether it meets the card association's standards. It's supporting evidence, not a guaranteed win.