Good day @luke__nguyen, Thank you for posting to the PayPal community. Please make sure the currency setup in your PayPal Live/Sandbox seller account and also check your Payment Receiving Preferences settings to allow payments that are sent to you in a currency you don't hold. Also, the transactions your trying to refund should be in "completed" status. https://www.paypal.com/us/cshelp/article/what-are-payment-receiving-preferences-and-how-can-i-set-them-help536 Once the above steps is done, please try processing a refund and make sure your passing correct amount value. If your still facing any issues, please create a MTS ticket via - https://www.paypal-support.com/s/?language=en_US with the detail information and error details. Sincerely, Chiranjeevi PayPal/Braintree MTS If this post or any other was helpful, please enrich the community by giving kudos or accepting it as a solution.
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