AUTHENTICATION_FAILURE when trying to access tranasactions API

[developers5tran]

Hi,

I created a app and generated token .

Now i am trying to access paypal Sync API to get transaction details and it is showing error :

{"name":"AUTHENTICATION_FAILURE","message":"Authentication failed due to invalid authentication credentials or a missing Authorization header.","links":[{"href":"https://developer.paypal.com/docs/api/overview....

can you please tell how to handle such cases

[developers5tran]

Can you please check with invoicing also as there also same thing persists.