In addition to the above two common signature methods, Pos machines have several other signature methods, such as digital signature, voice signature, fingerprint signature and so on. These signature methods are completed by specific technical means, and ensure the accuracy and security of the signature.

Digital signature uses cryptography to complete the signature, which has high security and tamper-proof ability. Voice signature is to identify the voice characteristics of users through voice recognition technology, which is used to confirm the validity of the transaction. Fingerprint signature is to use fingerprint identification technology to complete the signature, which is safer and more reliable than other methods.