Calling OIC3 Integration from Apex

Hi Team,

We have created a confidential application in IDCS and we got the client credentials. We have tested it in post man and we are able to get the token.

How to call OIC Integration From Oracle apex using  OAuth2 Client Credentials  ?? Without Passing user name & Password instead of Basic authentication.

Our team is using a procedure below, but it is failing. We have created wallet and downloaded required certificates.

CREATE OR REPLACE PROCEDURE call_oic_rest_api_get IS
-- OAuth token endpoint and credentials
lt_parm_names apex_application_global.VC_ARR2;
lt_parm_values apex_application_global.VC_ARR2;