Why do I get a 404 error for adyen.min.js after activating Magento's JS minification?
Check Magento’s minification
If you get a 404 when accessing adyen.min.js ,this could be happening because you enabled Magento's minification. However, the minified version of our `adyen.js` doesn’t exist with the following URL: https://checkoutshopper-live.adyen.com/checkoutshopper/sdk/3.4.0/adyen.min.js.
Add an exclusion rule
To resolve this, add an exclusion rule to your minifier. You have to create/update the configuration value for the dev/js/minify_exclude path to include the URL or a pattern of the URL.
INSERT INTO core_config_data (scope, scope_id, path, value) VALUES ('default', 0, 'dev/js/minify_exclude', 'adyen.com/checkoutshopper');
This SQL query could override a previous configuration if you have one, so you should check if it needs to be updated instead.