Hello, It sounds like you either created a button from within a sandbox account or you're using sample code from a smart payment button, which by default uses our sandbox environment. For website payments standard buttons, if you created the button from within a sandbox account, you will need to re-create the button from within a production account. For smart payment buttons, you will need to edit the button code and add in the "client id" from one of your own "LIVE" environment REST applications. Review the integration documentation for smart payment buttons where it explains what needs to be changed so the button will work for your account : https://developer.paypal.com/docs/checkout/standard/integrate/#link-addandmodifythecode Thanks !
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