how to add single product page extra popup element

could you able to provide code for add extra 3% fee for only card payments orders , if you able to help, it would be big help.

Hello,

You need to find a plugin to achieve more functionality that best suits you.
https://woocommerce.com/document/payment-gateway-based-fees/

Best Regards.

i would like to add by coding instead of plugins, could you help?

Hello,

Sorry but there is no option in Theme Settings available for that.

It requires customizations and this is beyond our limitations and support policy.

Regards.
Xtemos Studios

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