curl -L -X GET "https://api.box.com/2.0/integration_mappings/slack?partner_item_id=C987654321&box_item_id=123456789" \
     -H "authorization: Bearer <ACCESS_TOKEN>"

user_client.integration_mappings.get_slack_integration_mapping()

await userClient.integrationMappings.getSlackIntegrationMapping();

try await userClient.integrationMappings.getSlackIntegrationMapping()

userClient.getIntegrationMappings().getSlackIntegrationMapping()

await userClient.IntegrationMappings.GetSlackIntegrationMappingAsync();

{
  "limit": 1000,
  "next_marker": "JV9IRGZmieiBasejOG9yDCRNgd2ymoZIbjsxbJMjIs3kioVii",
  "entries": [
    {
      "id": "12345",
      "type": "integration_mapping",
      "partner_item": {
        "id": "C12378991223",
        "type": "channel",
        "slack_org_id": "E1234567"
      },
      "box_item": {
        "id": "12345",
        "type": "folder",
        "etag": "1",
        "sequence_id": "3",
        "name": "Contracts"
      },
      "integration_type": "slack",
      "is_manually_created": true,
      "options": {
        "is_access_management_disabled": true
      },
      "created_by": {
        "id": "11446498",
        "type": "user",
        "name": "Aaron Levie",
        "login": "ceo@example.com"
      },
      "modified_by": {
        "id": "11446498",
        "type": "user",
        "name": "Aaron Levie",
        "login": "ceo@example.com"
      },
      "created_at": "2012-12-12T10:53:43-08:00",
      "modified_at": "2012-12-12T10:53:43-08:00"
    }
  ]
}

{
  "type": "error",
  "status": 400,
  "code": "item_name_invalid",
  "message": "Method Not Allowed",
  "context_info": {
    "message": "Something went wrong"
  },
  "help_url": "https://developer.box.com/guides/api-calls/permissions-and-errors/common-errors/",
  "request_id": "abcdef123456"
}

{
  "type": "error",
  "status": 400,
  "code": "item_name_invalid",
  "message": "Method Not Allowed",
  "context_info": {
    "message": "Something went wrong"
  },
  "help_url": "https://developer.box.com/guides/api-calls/permissions-and-errors/common-errors/",
  "request_id": "abcdef123456"
}

{
  "type": "error",
  "status": 400,
  "code": "item_name_invalid",
  "message": "Method Not Allowed",
  "context_info": {
    "message": "Something went wrong"
  },
  "help_url": "https://developer.box.com/guides/api-calls/permissions-and-errors/common-errors/",
  "request_id": "abcdef123456"
}