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Fill this url with your parameters:
{$baseUrl}/rest/prioritycp/1.0/cpconfig?projectId={$projectId}&serviceDeskId={$serviceDeskId}&requestTypeId={$requestTypeId}

Example of localhost with two projects created in Jira, first project created in Jira Core and second with Jira Service Desk for first request type. 

http://localhost:8080/rest/prioritycp/1.0/cpconfig?projectId=10100&serviceDeskId=1&requestTypeId=1

Check the result.

If Priority Scheme will be not set for this project then the result would be like this:

{"isPriorityScheme":"false","isResolutionScheme":"false","excludedPriorities":[],"excludedResolutions":[]}

If you will encounter similar massage please check first if IssueType Priority Scheme is set for this particular project.

For previous example after adding Priority field to first request type result could look like this:

{"isPriorityScheme":"true","isResolutionScheme":"false","excludedPriorities":[{"id":"2","name":"high"},{"id":"3","name":"medium"},{"id":"4","name":"low"}],"excludedResolutions":[]}

If Priority Scheme isPriorityScheme will be not set for this project then the result would be like this: