I am unable to use Subscription REST API. I go the following error

[sysramthiru]

Hi,

I am unable to use Subscription REST API. I go the following error. What i need to do ?

{"name":"NOT_AUTHORIZED","message":"Authorization failed due to insufficient permissions.","debug_id":"afd9174138ac7","details":[{"issue":"PERMISSION_DENIED","description":"You do not have permission to access or perform operations on this resource."}],"links":[{"href":"https://developer.paypal.com/docs/api/v1/billing/subscriptions#NOT_AUTHORIZED","rel":"information_li..."}]}