UNPROCESSABLE_ENTITY error with PayPal buttons

[mavstuff]

Hi there! 

I am trying to integrate PayPal "Pay Now" JavaScript button on my website. It is working fine with Sandbox accounts but after change to live addresses and credentials it fails with 422 UNRPOCESSABLE_ENTITY error. 

The error in detail:

{
   "name":"UNPROCESSABLE_ENTITY",
   "details":[
      {
         "issue":"TRANSACTION_REFUSED",
         "description":"The request was refused"
      }
   ],
   "message":"The requested action could not be performed, semantically incorrect, or failed business validation.",
   "debug_id":"89ce0ee1f221",
   "links":[
      {
         "href":"https://developer.paypal.com/docs/api/orders/v2/#error-TRANSACTION_REFUSED",
         "rel":"information_link",
         "method":"GET"
      }
   ]
}

 What could be the issue for this?