The payment was successful, and your transfer is on its way to the recipient.
If your recipient has set up their Weixin account to receive transfers, the transfer should be processed in just a few moments. Once the transfer is successful, it will not be possible to cancel it.
However, in case your recipient hasn't linked their card to receive transfers via Weixin, you may wait for the transfer to expire. If the recipient doesn't fulfill the requirements necessary for accepting WeChat transfers, the transfer will be canceled automatically within 48 hours.