I have been trying to get my web site set up integrating the ecommerce form into the site.  I managed to get it working using Sandbox credentials but as soon as I switched it to "live", replacing the location ID, application ID and access tokens for live data, and attempted to charge myself $1.00, I began to receive the following error:

Caught exception!
Response body:

object(stdClass)[6]
  public 'errors' => 
    array (size=1)
      0 => 
        object(stdClass)[7]
          public 'category' => string 'INVALID_REQUEST_ERROR' (length=21)
          public 'code' => string 'NOT_FOUND' (length=9)
          public 'detail' => string 'Resource not found.' (length=19)
          public 'field' => string 'card_nonce' (length=10)

Response headers:

array (size=12)
  0 => string 'HTTP/1.1 404 Not Found' (length=22)
  'Content-Type' => string 'application/json' (length=16)
  'Vary' => string 'Accept-Encoding' (length=15)
  'X-Content-Type-Options' => string 'nosniff' (length=7)
  'X-Download-Options' => string 'noopen' (length=6)
  'X-Frame-Options' => string 'SAMEORIGIN' (length=10)
  'X-Permitted-Cross-Domain-Policies' => string 'none' (length=4)
  'X-Xss-Protection' => string '1; mode=block' (length=13)
  'Date' => string 'Sun, 12 Jun 2016 22:20:11 GMT' (length=29)
  'Content-Length' => string '121' (length=3)
  'Keep-Alive' => string 'timeout=60' (length=10)
  'Strict-Transport-Security' => string 'max-age=631152000' (length=17)

However, I know the nonce was created since I received my nonce received alert in the previous page.