Get a planning increment by series and increment ids.
curl -X GET \ https://myaccount.leankit.com/io/series/1234/increment/56789 \ -H 'Authorization: Basic base64encodedauthhere'
200 OK { "id": "56789", "label": "PI-1", "planningSeriesId": "1234", "startDate": "2022-01-01", "endDate": "2022-01-31", "parentPlanningIncrementId": null }