Hello @igurung ,

For a quick lookup, all content made available via DSS is covered in Refinitiv DataScope Select Data Content Guide.

I see several maturity data fields, most in Terms and Conditions template, for example:

{
    "ExtractionRequest": {
        "@odata.type": "#DataScope.Select.Api.Extractions.ExtractionRequests.TermsAndConditionsExtractionRequest",
        "ContentFieldNames": [
           "RIC", "Maturity Date"
        ],
        "IdentifierList": {
            "@odata.type": "#DataScope.Select.Api.Extractions.ExtractionRequests.InstrumentIdentifierList",
            "InstrumentIdentifiers": [
                { "Identifier": "US30YT=RR", "IdentifierType": "Ric" }
            ]
        }
    }
}

Resulting in:

{
    "@odata.context": "https://selectapi.datascope.refinitiv.com/RestApi/v1/$metadata#DataScope.Select.Api.Extractions.ExtractionRequests.ExtractionResult",
    "Contents": [
        {
            "IdentifierType": "Ric",
            "Identifier": "US30YT=RR",
            "RIC": "US30YT=RR",
            "Maturity Date": "2051-08-15"
        }
    ]

If you are looking for more insight and expertise on the available maturity content, the best way for a customer to get content questions answered, is to refer them to Refinitiv content experts directly via, Refinitiv Helpdesk Online -> Content -> DSS, and this forum will be of most help to you with DSS REST API usage questions