payment attestation

Payment attestation on-chain creates an immutable record that a payment was made at a specific time.链上支付证明创建了一个不可篡改的记录，证明某笔支付是在特定时间进行的。

Payment attestations enable automated accounting workflows by providing machine-readable proof of payment without manual verification.支付证明通过提供无需人工验证的机器可读支付凭证，实现了自动化的会计工作流程。