Solve the problem of connecting paypal

You need to solve the problem of connecting paypal
Did according to this instruction
https://developer.paypal.com/docs/business/checkout/set-up-standard-payments/
In the console after payment, a link to payment will come out
https://api.sandbox.paypal.com/v2/checkout/orders/68534585T91843443
Its such an error.

message: {"name":"AUTHENTICATION_FAILURE","message":"Authentication failed due to invalid authentication credentials or a missing Authorization header.","links":[{"href":"