Is Tongcheng's postal reimbursement voucher postal?

Postal reimbursement vouchers for the whole journey do not necessarily use postal services. Tongcheng can choose to use different logistics service providers to complete the mailing of reimbursement vouchers. Common logistics service providers are Post, SF Express and Tong Yuan. Which logistics service provider to choose may depend on geographical location, express speed, service quality and other factors. If you need to know which logistics service provider Tongcheng mail reimbursement voucher uses, I suggest you consult Tongcheng Company directly.