Paypal Live Mode Issue

Hi there

We are integration Paypal Rest API here https://getitinerary.com/ . REST API Payments get error 401 UNAUTHORIZED when using live credentials, in testing credentials all working ok. Below you will see the debug id and error message. Can you please look into this

[21-10-2018 04:44:04] PayPalCorePayPalHttpConnection : INFO: POST https://api.paypal.com/v1/oauth2/token

[21-10-2018 04:44:04] PayPalCorePayPalHttpConnection : INFO: Response Status : 200

[21-10-2018 04:44:04] PayPalCorePayPalHttpConnection : INFO: POST https://api.paypal.com/v1/payments/payment

[21-10-2018 04:44:05] PayPalCorePayPalHttpConnection : INFO: Response Status : 401

[21-10-2018 04:44:05] PayPalCorePayPalHttpConnection : ERROR: Got Http response code 401 when accessing https://api.paypal.com/v1/payments/payment. {"name":"UNAUTHORIZED_PAYMENT","message":"Unauthorized payment.","information_link":"https://developer.paypal.com/docs/api/payments/#errors","debug_id":"dfe6720d1ef30"}

Thank you