X-PAYPAL-APPLICATION-ID header invalid value

-- HikaShop version -- : 2.2.1
-- Joomla version -- : 3.1.5

Hi, I'm trying to test the paypal adaptive plugin. I've configured the plugin parameters using the test APP-80W284485P519543T

When I go buy something and click to proceed with payment I receive this error message:

The X-PAYPAL-APPLICATION-ID header contains an invalid value

What's wrong? What should I configure?

I've seeted the plugin parameter to YES in debug field.

Now when I go to buy something I got this:

array(11) {
["requestEnvelope"]=>
array(1) {
["errorLanguage"]=>
string(5) "en_US"
}
["actionType"]=>
string(3) "PAY"
["currencyCode"]=>
string(3) "EUR"
["receiverList"]=>
array(2) {
[0]=>
array(2) {
["email"]=>

etc... etc... etc...


And the order is created but not confirmed. Is that right?

Also the error message says:

Authentication failed. API credentials are incorrect.

Thanks Jerome,

I've reviewed the sandobox credentials, my fault: wrong data inserted in the plugin configuration.

Now it seems work fine, tested the payment in parallel mode. Anyway the orders still results as created and not confirmed?

Is that right or something misconfigured? In the Adaptive plugin it's setted:
Invalid status > cancelled
Pending status > created
Verified status > confirmed