Dynamically Segment CXone Outbound Contact Lists by Real-Time Engagement Scores

How-To-Articles
1

Dynamically Segment CXone Outbound Contact Lists by Real-Time Engagement Scores

What You Will Build

  • A Python script that retrieves contacts from a CXone source contact list, filters them by a real-time engagement score threshold, and computes a set intersection with a target list.
  • The script uses the CXone Outbound Contact API and Contact List API to synchronize the intersected contact IDs back to a dynamic outbound list.
  • All code uses Python 3.9+ with the requests library, explicit type hints, and production-grade error handling.

Prerequisites

  • CXone OAuth 2.0 Client Credentials grant with the outboundapi scope
  • CXone API v2 endpoints (/api/v2/outbound/...)
  • Python 3.9 or newer
  • requests library (pip install requests)
  • Source contact list ID and target contact list ID
  • Environment variables: CXONE_DOMAIN, CXONE_CLIENT_ID, CXONE_CLIENT_SECRET

Authentication Setup

CXone uses a standard OAuth 2.0 Client Credentials flow. The token endpoint returns a short-lived access token that must be cached and refreshed before expiration. The following class handles token acquisition, caching, and automatic retry on 401 Unauthorized responses.

import os
import time
import logging
import requests
from typing import Optional, Dict, Any

logging.basicConfig(level=logging.INFO, format="%(asctime)s [%(levelname)s] %(message)s")
logger = logging.getLogger(__name__)

class CXoneAuth:
    def __init__(self, domain: str, client_id: str, client_secret: str):
        self.domain = domain.replace("https://", "").replace("http://", "")
        self.client_id = client_id
        self.client_secret = client_secret
        self.token_url = f"https://{self.domain}/oauth/token"
        self.access_token: Optional[str] = None
        self.token_expiry: float = 0.0

    def _fetch_token(self) -> str:
        payload = {
            "grant_type": "client_credentials",
            "client_id": self.client_id,
            "client_secret": self.client_secret
        }
        headers = {"Content-Type": "application/json"}
        response = requests.post(self.token_url, json=payload, headers=headers, timeout=15)
        response.raise_for_status()
        data = response.json()
        self.access_token = data["access_token"]
        self.token_expiry = time.time() + data["expires_in"] - 60  # Refresh 60s early
        return self.access_token

    def get_token(self) -> str:
        if self.access_token and time.time() < self.token_expiry:
            return self.access_token
        logger.info("Auth token expired or missing. Requesting new token.")
        return self._fetch_token()

    def get_headers(self) -> Dict[str, str]:
        return {
            "Authorization": f"Bearer {self.get_token()}",
            "Content-Type": "application/json"
        }

Implementation

Step 1: Paginated Contact Retrieval with Retry Logic

The CXone Outbound API returns contact list items in paginated batches. The /api/v2/outbound/contactlists/{contactListId}/contacts endpoint supports count and start parameters. You must handle 429 Too Many Requests responses with exponential backoff to avoid cascading rate limits. The following function implements a safe pagination loop.

from typing import List, Any

def fetch_contacts_paginated(
    base_url: str,
    list_id: str,
    auth: CXoneAuth,
    count: int = 1000
) -> List[Dict[str, Any]]:
    all_contacts: List[Dict[str, Any]] = []
    start = 0
    max_retries = 5
    base_delay = 2.0

    while True:
        url = f"{base_url}/outbound/contactlists/{list_id}/contacts"
        params = {"count": count, "start": start}
        headers = auth.get_headers()

        for attempt in range(max_retries):
            try:
                response = requests.get(url, headers=headers, params=params, timeout=30)
                
                if response.status_code == 429:
                    retry_after = int(response.headers.get("Retry-After", base_delay * (2 ** attempt)))
                    logger.warning("Rate limited (429). Waiting %d seconds.", retry_after)
                    time.sleep(retry_after)
                    continue
                
                response.raise_for_status()
                data = response.json()
                contacts = data.get("contacts", [])
                
                if not contacts:
                    logger.info("No more contacts returned. Pagination complete.")
                    return all_contacts
                
                all_contacts.extend(contacts)
                start += len(contacts)
                break  # Success, exit retry loop
            
            except requests.exceptions.RequestException as exc:
                logger.error("HTTP request failed: %s", exc)
                if attempt == max_retries - 1:
                    raise
                time.sleep(base_delay * (2 ** attempt))
    
    return all_contacts

Step 2: Engagement Score Filtering and Set Intersection

CXone contacts include an engagementScore field representing the real-time propensity score (typically 0-100). You will filter contacts that meet or exceed a threshold, then perform a Python set intersection with a target list to identify contacts that qualify for both segments.

def filter_and_intersect_contacts(
    source_contacts: List[Dict[str, Any]],
    target_contacts: List[Dict[str, Any]],
    min_engagement_score: int
) -> set[str]:
    source_ids = {
        c["id"] for c in source_contacts 
        if c.get("engagementScore", 0) >= min_engagement_score
    }
    target_ids = {c["id"] for c in target_contacts}
    
    intersected_ids = source_ids.intersection(target_ids)
    logger.info(
        "Filtering complete. Source qualified: %d, Target list: %d, Intersection: %d",
        len(source_ids), len(target_ids), len(intersected_ids)
    )
    return intersected_ids

Step 3: Bulk Synchronization to Target Contact List

CXone accepts bulk contact list updates via POST /api/v2/outbound/contactlists/{contactListId}/contacts. The API enforces payload size limits, so you must chunk the intersection results. The following function handles chunking, idempotent upserts, and retry logic for transient failures.

def sync_contacts_to_list(
    base_url: str,
    target_list_id: str,
    contact_ids: set[str],
    auth: CXoneAuth,
    chunk_size: int = 500
) -> None:
    if not contact_ids:
        logger.info("No contacts to sync. Exiting.")
        return

    contact_list = sorted(list(contact_ids))
    chunks = [contact_list[i:i + chunk_size] for i in range(0, len(contact_list), chunk_size)]
    url = f"{base_url}/outbound/contactlists/{target_list_id}/contacts"
    max_retries = 5
    base_delay = 2.0

    for idx, chunk in enumerate(chunks):
        payload = {"contactIds": chunk}
        headers = auth.get_headers()
        
        for attempt in range(max_retries):
            try:
                response = requests.post(url, json=payload, headers=headers, timeout=30)
                
                if response.status_code == 429:
                    retry_after = int(response.headers.get("Retry-After", base_delay * (2 ** attempt)))
                    logger.warning("Rate limited on chunk %d. Waiting %d seconds.", idx, retry_after)
                    time.sleep(retry_after)
                    continue
                
                if response.status_code in (200, 201, 204):
                    logger.info("Chunk %d synced successfully (%d contacts).", idx, len(chunk))
                    break
                
                logger.error("Sync failed on chunk %d: %s", idx, response.text)
                response.raise_for_status()
            
            except requests.exceptions.RequestException as exc:
                logger.error("Chunk %d request error: %s", idx, exc)
                if attempt == max_retries - 1:
                    raise
                time.sleep(base_delay * (2 ** attempt))

Complete Working Example

The following script combines authentication, pagination, filtering, intersection, and synchronization into a single executable module. Replace the placeholder configuration values with your CXone tenant details.

import os
import sys
import logging
import requests
from typing import Dict, Any, List

# Import classes and functions from previous sections
# (In production, place CXoneAuth, fetch_contacts_paginated, 
#  filter_and_intersect_contacts, sync_contacts_to_list in separate modules)

logging.basicConfig(level=logging.INFO, format="%(asctime)s [%(levelname)s] %(message)s")
logger = logging.getLogger(__name__)

def main() -> None:
    domain = os.getenv("CXONE_DOMAIN")
    client_id = os.getenv("CXONE_CLIENT_ID")
    client_secret = os.getenv("CXONE_CLIENT_SECRET")
    source_list_id = os.getenv("CXONE_SOURCE_LIST_ID")
    target_list_id = os.getenv("CXONE_TARGET_LIST_ID")
    min_score = int(os.getenv("CXONE_MIN_ENGAGEMENT_SCORE", "75"))

    if not all([domain, client_id, client_secret, source_list_id, target_list_id]):
        logger.error("Missing required environment variables.")
        sys.exit(1)

    base_url = f"https://{domain}/api/v2"
    auth = CXoneAuth(domain, client_id, client_secret)

    try:
        logger.info("Fetching source contacts from list %s", source_list_id)
        source_contacts = fetch_contacts_paginated(base_url, source_list_id, auth)
        
        logger.info("Fetching target contacts from list %s", target_list_id)
        target_contacts = fetch_contacts_paginated(base_url, target_list_id, auth)

        logger.info("Filtering by engagement score >= %d and computing intersection", min_score)
        intersected_ids = filter_and_intersect_contacts(source_contacts, target_contacts, min_score)

        logger.info("Syncing %d intersected contacts to target list %s", len(intersected_ids), target_list_id)
        sync_contacts_to_list(base_url, target_list_id, intersected_ids, auth)
        
        logger.info("Dynamic segmentation complete.")
    
    except Exception as exc:
        logger.error("Execution failed: %s", exc)
        sys.exit(1)

if __name__ == "__main__":
    main()

Common Errors & Debugging

Error: 401 Unauthorized

  • Cause: The OAuth token has expired, the client credentials are incorrect, or the outboundapi scope is missing from the registered client.
  • Fix: Verify the CXONE_CLIENT_ID and CXONE_CLIENT_SECRET values. Ensure the OAuth client in the CXone admin console has the outboundapi scope enabled. The CXoneAuth class automatically refreshes tokens, but initial credential mismatches will fail immediately.

Error: 403 Forbidden

  • Cause: The authenticated user lacks permission to access the specified contact list, or the list is restricted to a different security profile.
  • Fix: Assign the OAuth client to a security profile that includes Outbound Contact List read/write permissions. Verify that the source_list_id and target_list_id belong to the same tenant.

Error: 429 Too Many Requests

  • Cause: The CXone API enforces per-tenant and per-endpoint rate limits. Bulk pagination and synchronization can trigger cascading limits.
  • Fix: The provided code implements exponential backoff with Retry-After header parsing. If limits persist, reduce the count parameter in fetch_contacts_paginated or increase the delay between chunks in sync_contacts_to_list.

Error: 404 Not Found

  • Cause: The source_list_id or target_list_id does not exist, or the contact IDs in the intersection payload reference archived or deleted contacts.
  • Fix: Validate list IDs using GET /api/v2/outbound/contactlists/{id} before execution. Filter out contacts with status != "ACTIVE" if your CXone configuration archives low-score contacts automatically.

Error: Payload Too Large (413)

  • Cause: Sending more than 1,000 contact IDs in a single POST /api/v2/outbound/contactlists/{id}/contacts request.
  • Fix: The sync_contacts_to_list function chunks requests to 500 IDs by default. Adjust the chunk_size parameter if your tenant enforces stricter limits, or split the synchronization across multiple API calls.

Official References