PayPal NVP API error : Sorry, we can’t complete your purchase at this time
<p>I'm using PayPal NVP API. <br>
When I use sandbox account and sandbox API_ENDPOINT, it works well. <br>
When I use production account and production API_ENDPOINT, it is successfully redirecting to PayPal, but after user input paypal username and password and submit, it shows: "Sorry, we can’t complete your purchase at this time. Please return to the merchant’s website and choose another way to pay."<br>
I have created an app in developer.paypal.com, but still get this error.<br>
Any one can help?<br></p>

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