Users can submit an expense request with a negative amount on the Mesh platform. Negative expenses can represent corporate card refunds or accidental employee spending. When submitting such an expense, users simply need to type a negative amount. However, Mesh will only process the payout if the total amount exceeds $0.00. Additionally, negative amounts can indicate an accidental spend where the submitter owes funds to the company due to card misuse, supporting a 'clawback' mechanism for cases where a transaction is declined during the transaction post-approval. 

To submit such an expense, follow the steps detailed here and simply type a negative amount.