The reason why I need to sign the official card for reimbursement is mainly to confirm the identity of the reimbursement person and ensure the authenticity and compliance of reimbursement. My signature indicates that the accountant assumes the responsibility and authorizes the relevant examination and approval, and at the same time meets the compliance requirements to ensure the credibility of financial reimbursement and audit traceability. Specific regulations may vary by organization and region. It is recommended to abide by the relevant policies of your company and consult the financial department for accurate guidance and requirements.