Existing OSDF APIs are not sufficient for TNAP slicing use case. In our use case we have to select NSST at runtime. A new API is required "selectNSST". 

SO macro flow is enhanced to trigger OOF api. 

Sample NSST selection request from SO could be like:
curl --location --request POST 'https://{{k8s:30248/api/oof/v1/selection/nsst' }}
{{--header 'Content-Type: application/json' }}
{{--header 'Authorization: Basic dGVzdDp0ZXN0cHdk' }}
{{--header 'Cookie: JSESSIONID=8873161B92F94EA8FA15E5E87108B76F' }}
--data-raw '{
    "requestInfo": {
        "transactionId": "c86b3019-39f4-4cd3-b847-b22afe9f36dc",
        "requestId": "c86b3019-39f4-4cd3-b847-b22afe9f36dc",
        "sourceId": "so",
        "timeout": 600,
        "callbackUrl": "http://0.0.0.0:9000/callback/"
    },
    "sliceProfile": {
        "latency" : 20,
        "areaTrafficCapDL" :800
    }
}'