Adding an OKTA Key manager is throwing errors in carbon log

[anupbvr]

Description:
Adding an OKTA Key manager is throwing errors in carbon log

Affected Product Version:
APIM 3.2.0
apim-km-okta - 3.0.5

OS, DB, other environment details and versions:
Windows
Installed using zip.

Steps to reproduce:

1. Install wso2 apim 3.2.0 using zip.
2. Enable debug logs for apimgmt.
3. Start the wso2 apim using bat script.
4. Go to admin console, add a new Key manager of type OKTA. Input valid required fields.
5. After add, refer the carbon logs, wso2 reports JSON mal formed errors for following OKTA URLS.

https://dev-************.okta.com/oauth2/default/v1/authorize
https://dev-************.okta.com/oauth2/default/v1/introspect
https://dev-************.okta.com/oauth2/default/v1/keys
https://dev-************.okta.com/
https://dev-************.okta.com/oauth2/default/v1/revoke

TID: [-1234] [api/am/admin] [2021-04-17 12:19:33,946] DEBUG {org.wso2.carbon.apimgt.impl.APIAdminImpl} - Error while parsing element https://dev-************.okta.com/oauth2/default/v1/revoke com.google.gson.JsonSyntaxException: com.google.gson.stream.MalformedJsonException: Use JsonReader.setLenient(true) to accept malformed JSON at line 1 column 7 path $

wso2-carbon.log