When I try to run the below API calls. I got result as null.
https://XXX.atlassian.net/rest/servicedeskapi/servicedesk/{serviceDeskId}/customer
is this api GET request is still valid? or any updated API calls for getting list of customers.
The API endpoint that you are trying to use is only available on JSM Cloud, JSM Server/Data Center only has an endpoint to add customers, not get. Here is the API documentation for it, https://docs.atlassian.com/jira-servicedesk/REST/5.11.3/#servicedeskapi/servicedesk/{serviceDeskId}/customer
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