Unable to refund manually – JS error

Enable SCRIPT_DEBUG https://codex.www.ads-software.com/Debugging_in_WordPress#SCRIPT_DEBUG then see what the error reads.

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The ajax endpoint must not be returning any data then. Might be an error – see your server error logs and look for fatal errors. You could also check the XHR tab in your console (similar to https://mikejolley.com/2015/11/12/debugging-unexpected-token-in-woocommerce-2-4/)

You are right, I found this error.

<br />
<b>Fatal error</b>:  Call to a member function get_currencies() on a non-object in <b>/home/bhartiwe/public_html/astropoint/wp-content/plugins/woocommerce-tm-extra-product-options/include/class-tm-epo-helper-base.php</b> on line <b>424</b><br />

An update is available, perhaps it’ll solve the issue.

Glad you found it.