If you log into your Shein account and click on the "My Wallet" button. From there you can click the on the submit button on the right and fill out the amount you would like to withdraw. This amount will be deposited to the original form of payment you used to make your purchase. Please make sure that your original form of payment is up to date and still valid.
Ps: The refunf of cod orders can't be withdrawed from wallet, but can be used in new order.