Paypal button returns a $NaN value for the total.
This issue usually appears if you set the tax and added % sign in TAX field.
- Please go to Paypal Button editor.
- Click on Product tab.
- Choose Tax.
- Insert the number without percentage % sign.
You can check this article, if you would like to know more about PayPal Button app: Intro to POWR PayPal Button
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