Request parties from your services with RequestPartyService

async function getEntityToken(titleId, secretKey) {
  try {

    // Construct the request URL
    const requestUrl =
      `https://${titleId}.playfabapi.com/Authentication/GetEntityToken`;

    // Create headers with your secret key and content type
    const headers = {
      'X-SecretKey': secretKey,
      'Content-Type': 'application/json', // Add this line
    };

    // Make the POST request
    const response = await fetch(requestUrl, {
      method: 'POST',
      headers: headers,
    });

    // Check if the response is successful
    if (response.ok) {
      const responseBody = await response.json();
      console.log(`Entity Token: ${responseBody.data.EntityToken}`);
      return responseBody.data.EntityToken;
    } else {
      console.error(`Error: ${response.status}`);
    }
  } catch (error) {
    console.error(`Exception: ${error.message}`);
  }
}

async function requestPartyService(titleId, entityToken) {
  try {

    // Construct the request URL
    const requestUrl = `https://${titleId}.playfabapi.com/Party/RequestPartyService`;

    // Create headers with the entity token and content type
    const headers = {
      'X-EntityToken': entityToken,
      'Content-Type': 'application/json',
    };

    // Create the request body with PartyNetworkConfiguration and PreferredRegions
    const requestBody = {
      NetworkConfiguration: {
        MaxUsers: 4,
        MaxDevices: 4,
        MaxDevicesPerUser: 1,
        MaxUsersPerDevice: 1,
      },
      PreferredRegions: ['WestUs'],
    };

    // Make the POST request
    const response = await fetch(requestUrl, {
      method: 'POST',
      headers: headers,
      body: JSON.stringify(requestBody),
    });

    // Check if the response is successful
    if (response.ok) {
      const responseBody = await response.json();
      console.log('Party service response:', responseBody);
    } else {
      console.error(`Error: ${response.status}`);
    }
  } catch (error) {
    console.error(`Exception: ${error.message}`);
  }
  return null;
}

{
    "code": 200,
    "status": "OK",
    "data": {
        "PartyId": "0543645b-9004-4784-95d7-459cef4a23fa",
        "SerializedNetworkDescriptor": "AwBnP28mW2RDBQSQhEeV10Wc70oj+ldlc3RVcwAAAAAAAAAAAAAAAAAAPXqiEpapxSC+Owo1h8qJ5NuEOmtS0oeJqq8h6q5ybZZrbktkbnMtaXIwLTgxZTUtNTI3MWZiZDYtMmMyYS00NGE0LThhNjAtNmZlZjI4ZDAzMjc5Lndlc3R1cy5jbG91ZGFwcC5henVyZS5jb20=",
        "InvitationId": "e95366d4-c9ed-4a6e-94f6-215c1d69d467"
    }
}