凭证 (píng zhèng): proof; certificate; receipt; voucher

When you claim reimbursement for a meal, you must attach the restaurant receipt as proof; otherwise, finance won't transfer the money to you.

The police asked the witness to provide evidence of the suspicious person seen that night, such as photos or surveillance footage.

In ancient times, merchants often used a stamped contract as proof in transactions, indicating that both parties agreed to the terms.

If you lose your passport, before getting a new one, it's best to keep a photocopy as proof of identity.

This company requires new employees to present their degree certificate and ID card as proof of qualifications when onboarding.