Schedule NICE CXone SMS Message Bursts via Digital API with Node.js

What You Will Build

A Node.js module that constructs and submits SMS burst schedules to the NICE CXone Digital API, validates payloads against gateway constraints, enforces frequency caps, and tracks execution metrics. It uses the CXone Digital Messaging API and OAuth 2.0 Client Credentials flow. The tutorial covers Node.js 18+ with axios, zod, and pino.

Prerequisites

• CXone tenant domain and OAuth 2.0 client credentials (client ID and client secret)
• Required OAuth scopes: digital:schedules:write, digital:contacts:read, digital:messaging:write, digital:events:subscribe
• Node.js 18 or later
• External dependencies: npm install axios zod pino uuid

Authentication Setup

CXone uses the OAuth 2.0 Client Credentials grant. You must request an access token from your tenant authorization server. The token expires after a fixed duration, so you must implement caching and refresh logic to avoid 401 errors during burst scheduling.

import axios from 'axios';
import { v4 as uuidv4 } from 'uuid';

const CXONE_DOMAIN = process.env.CXONE_DOMAIN;
const CLIENT_ID = process.env.CXONE_CLIENT_ID;
const CLIENT_SECRET = process.env.CXONE_CLIENT_SECRET;

const TOKEN_CACHE = { token: null, expiresAt: 0 };

export async function acquireAccessToken() {
  if (TOKEN_CACHE.token && Date.now() < TOKEN_CACHE.expiresAt) {
    return TOKEN_CACHE.token;
  }

  const tokenUrl = `https://${CXONE_DOMAIN}.platform.nicecxone.com/oauth/token`;
  const params = new URLSearchParams({
    grant_type: 'client_credentials',
    client_id: CLIENT_ID,
    client_secret: CLIENT_SECRET,
    scope: 'digital:schedules:write digital:contacts:read digital:messaging:write digital:events:subscribe'
  });

  const response = await axios.post(tokenUrl, params, {
    headers: { 'Content-Type': 'application/x-www-form-urlencoded' }
  });

  TOKEN_CACHE.token = response.data.access_token;
  TOKEN_CACHE.expiresAt = Date.now() + (response.data.expires_in * 1000) - 60000;
  return TOKEN_CACHE.token;
}

Implementation

Step 1: Payload Construction & Constraint Validation

You must construct the schedule payload with contact list references, send window matrices, frequency cap directives, and burst configuration. CXone enforces strict gateway constraints: maximum concurrent sends per schedule, valid ISO 8601 send windows, and frequency cap limits. You will validate the payload against a Zod schema before submission.

import { z } from 'zod';

const SendWindowSchema = z.object({
  start: z.string().regex(/^\d{2}:\d{2}$/),
  end: z.string().regex(/^\d{2}:\d{2}$/),
  timezone: z.string().default('America/New_York')
});

const FrequencyCapSchema = z.object({
  limit: z.number().int().min(1).max(10),
  windowMinutes: z.number().int().min(15).max(1440)
});

const BurstConfigSchema = z.object({
  maxConcurrentSends: z.number().int().min(1).max(500),
  priority: z.enum(['LOW', 'NORMAL', 'HIGH', 'URGENT']),
  throttleRps: z.number().int().min(1).max(100)
});

const SchedulePayloadSchema = z.object({
  name: z.string().min(3).max(100),
  type: z.literal('SMS'),
  contactListId: z.string().uuid(),
  templateId: z.string().uuid(),
  sendWindow: SendWindowSchema,
  frequencyCap: FrequencyCapSchema,
  burstConfig: BurstConfigSchema,
  scheduleTime: z.string().datetime(),
  status: z.enum(['DRAFT', 'SCHEDULED', 'ACTIVE', 'PAUSED'])
});

export function validateSchedulePayload(payload) {
  const result = SchedulePayloadSchema.safeParse(payload);
  if (!result.success) {
    const errors = result.error.errors.map(e => `${e.path.join('.')}: ${e.message}`);
    throw new Error(`Schema validation failed: ${errors.join(', ')}`);
  }
  return result.data;
}

Step 2: Compliance Verification & Opt-in Filtering

Before submitting the schedule, you must verify that the contact list meets carrier compliance requirements and that opt-in status is confirmed. CXone provides contact list metadata and opt-in endpoints. You will query the list, verify opt-in percentages, and check for suppressed contacts.

export async function verifyCompliance(token, contactListId) {
  const base = `https://${CXONE_DOMAIN}.platform.nicecxone.com/api/v2/digital/contacts/lists/${contactListId}`;
  
  const [listResponse, optinResponse] = await Promise.all([
    axios.get(`${base}`, { headers: { Authorization: `Bearer ${token}` } }),
    axios.get(`${base}/optin`, { headers: { Authorization: `Bearer ${token}` } })
  ]);

  const listData = listResponse.data;
  const optinData = optinResponse.data;

  if (optinData.optedInPercentage < 95) {
    throw new Error(`Opt-in percentage ${optinData.optedInPercentage}% falls below the 95% compliance threshold.`);
  }

  if (listData.suppressedCount > 0) {
    console.warn(`Warning: ${listData.suppressedCount} contacts are suppressed. They will be excluded from the burst.`);
  }

  return {
    totalContacts: listData.totalCount,
    optedInPercentage: optinData.optedInPercentage,
    suppressedCount: listData.suppressedCount,
    complianceStatus: 'APPROVED'
  };
}

Step 3: Schedule Submission & Burst Configuration

You will submit the validated payload to CXone using a POST request for initial creation, then use an atomic PUT operation to apply burst configuration and queue prioritization triggers. CXone returns a schedule ID that you must track for iteration and audit logging.

export async function createAndConfigureSchedule(token, payload) {
  const base = `https://${CXONE_DOMAIN}.platform.nicecxone.com/api/v2/digital/messaging/schedules`;
  
  const createPayload = {
    ...payload,
    status: 'DRAFT'
  };

  const createResponse = await axios.post(base, createPayload, {
    headers: { 
      Authorization: `Bearer ${token}`,
      'Content-Type': 'application/json'
    }
  });

  const scheduleId = createResponse.data.id;
  console.log(`Schedule created with ID: ${scheduleId}`);

  const updatePayload = {
    ...payload,
    status: 'SCHEDULED',
    burstConfig: {
      ...payload.burstConfig,
      queuePriority: payload.burstConfig.priority === 'URGENT' ? 'HIGH_PRIORITY_QUEUE' : 'STANDARD_QUEUE',
      autoRetryOnThrottle: true
    }
  };

  const updateResponse = await axios.put(`${base}/${scheduleId}`, updatePayload, {
    headers: { 
      Authorization: `Bearer ${token}`,
      'Content-Type': 'application/json'
    }
  });

  return {
    scheduleId,
    status: updateResponse.data.status,
    burstConfig: updateResponse.data.burstConfig
  };
}

Step 4: Retry Logic & Latency Tracking

CXone enforces strict rate limits on scheduling endpoints. You must implement exponential backoff for 429 responses. You will also track scheduling latency and execution success rates for governance reporting.

export async function executeWithRetry(fn, maxRetries = 3) {
  let attempt = 0;
  while (true) {
    try {
      const startTime = Date.now();
      const result = await fn();
      const latency = Date.now() - startTime;
      return { result, latency, success: true, attempt };
    } catch (error) {
      attempt++;
      if (error.response?.status === 429 && attempt <= maxRetries) {
        const retryAfter = error.response.headers['retry-after'] || Math.pow(2, attempt);
        console.warn(`Rate limited. Retrying in ${retryAfter} seconds (attempt ${attempt}/${maxRetries})`);
        await new Promise(res => setTimeout(res, retryAfter * 1000));
        continue;
      }
      throw error;
    }
  }
}

Step 5: Webhook Registration & Audit Logging

You must synchronize scheduling events with external campaign managers via webhook callbacks. CXone exposes an events subscription endpoint. You will register a webhook for schedule.created, schedule.executed, and schedule.failed events, then generate structured audit logs using pino.

import pino from 'pino';

const logger = pino({
  level: 'info',
  transport: { target: 'pino/file', options: { destination: 'schedule_audit.log' } }
});

export async function registerScheduleWebhook(token, callbackUrl) {
  const base = `https://${CXONE_DOMAIN}.platform.nicecxone.com/api/v2/digital/events/subscriptions`;
  const webhookPayload = {
    name: `burst-scheduler-sync-${uuidv4()}`,
    url: callbackUrl,
    events: ['schedule.created', 'schedule.executed', 'schedule.failed', 'message.delivered', 'message.failed'],
    status: 'ACTIVE',
    retryPolicy: { maxRetries: 3, backoffMultiplier: 2 }
  };

  const response = await axios.post(base, webhookPayload, {
    headers: { 
      Authorization: `Bearer ${token}`,
      'Content-Type': 'application/json'
    }
  });

  logger.info({
    event: 'webhook_registered',
    subscriptionId: response.data.id,
    url: callbackUrl,
    events: webhookPayload.events
  });

  return response.data;
}

export function logScheduleAudit(action, scheduleId, payload, latency, success) {
  logger.info({
    action,
    scheduleId,
    payloadSummary: {
      contactListId: payload.contactListId,
      burstConfig: payload.burstConfig,
      frequencyCap: payload.frequencyCap
    },
    latencyMs: latency,
    success,
    timestamp: new Date().toISOString()
  });
}

Complete Working Example

The following module combines authentication, validation, compliance checking, schedule creation, retry logic, webhook registration, and audit logging into a single runnable scheduler class.

import { acquireAccessToken } from './auth';
import { validateSchedulePayload, verifyCompliance, createAndConfigureSchedule, executeWithRetry, registerScheduleWebhook, logScheduleAudit } from './scheduler';

class CXoneBurstScheduler {
  constructor(domain, clientId, clientSecret) {
    this.domain = domain;
    this.clientId = clientId;
    this.clientSecret = clientSecret;
    this.metrics = { totalSchedules: 0, successfulBursts: 0, failedBursts: 0, avgLatency: 0 };
  }

  async scheduleBurst(payload, webhookUrl) {
    const token = await acquireAccessToken(this.clientId, this.clientSecret);
    
    try {
      const validatedPayload = validateSchedulePayload(payload);
      
      const compliance = await verifyCompliance(token, validatedPayload.contactListId);
      if (compliance.complianceStatus !== 'APPROVED') {
        throw new Error('Compliance verification failed');
      }

      const execution = await executeWithRetry(() => 
        createAndConfigureSchedule(token, validatedPayload)
      );

      logScheduleAudit('schedule_created', execution.result.scheduleId, validatedPayload, execution.latency, execution.success);

      if (webhookUrl) {
        await registerScheduleWebhook(token, webhookUrl);
      }

      this.metrics.totalSchedules++;
      this.metrics.successfulBursts++;
      this.metrics.avgLatency = ((this.metrics.avgLatency * (this.metrics.totalSchedules - 1)) + execution.latency) / this.metrics.totalSchedules;

      return {
        scheduleId: execution.result.scheduleId,
        compliance,
        latency: execution.latency,
        metrics: this.metrics
      };
    } catch (error) {
      this.metrics.totalSchedules++;
      this.metrics.failedBursts++;
      logScheduleAudit('schedule_failed', payload.contactListId || 'unknown', payload, 0, false);
      throw error;
    }
  }

  getMetrics() {
    return this.metrics;
  }
}

export default CXoneBurstScheduler;

// Usage example
async function run() {
  const scheduler = new CXoneBurstScheduler(
    process.env.CXONE_DOMAIN,
    process.env.CXONE_CLIENT_ID,
    process.env.CXONE_CLIENT_SECRET
  );

  const schedulePayload = {
    name: 'Q4-Product-Launch-Burst',
    type: 'SMS',
    contactListId: 'a1b2c3d4-e5f6-7890-abcd-ef1234567890',
    templateId: 't9u8i7o6-p5a4-s3d2-f1g0-h9j8k7l6m5n4',
    sendWindow: { start: '09:00', end: '17:00', timezone: 'America/New_York' },
    frequencyCap: { limit: 3, windowMinutes: 60 },
    burstConfig: { maxConcurrentSends: 150, priority: 'HIGH', throttleRps: 45 },
    scheduleTime: '2024-11-15T14:00:00Z',
    status: 'SCHEDULED'
  };

  try {
    const result = await scheduler.scheduleBurst(schedulePayload, 'https://campaign-manager.internal/webhooks/cxone');
    console.log('Schedule submitted successfully:', result);
  } catch (error) {
    console.error('Schedule submission failed:', error.response?.data || error.message);
  }
}

run();

Common Errors & Debugging

Error: 401 Unauthorized

• What causes it: Expired OAuth token, invalid client credentials, or missing Authorization header.
• How to fix it: Verify the token cache logic refreshes before expiration. Check that the client ID and secret match a registered CXone integration. Ensure the Bearer prefix is included in the header.
• Code showing the fix: The acquireAccessToken function includes an expiration buffer and automatically re-fetches the token when Date.now() >= TOKEN_CACHE.expiresAt.

Error: 403 Forbidden

• What causes it: Missing OAuth scopes or insufficient tenant permissions for Digital scheduling.
• How to fix it: Add digital:schedules:write and digital:messaging:write to the integration scope list in the CXone admin console. Verify the client is not restricted to read-only operations.
• Code showing the fix: The token request explicitly requests digital:schedules:write digital:contacts:read digital:messaging:write digital:events:subscribe.

Error: 400 Bad Request (Schema or Constraint Violation)

• What causes it: Invalid send window format, frequency cap exceeding gateway limits, or contact list ID mismatch.
• How to fix it: Validate payloads against the Zod schema before submission. Ensure maxConcurrentSends does not exceed your tenant gateway limit (typically 500). Verify contact list IDs match active Digital lists.
• Code showing the fix: The validateSchedulePayload function rejects malformed payloads before they reach CXone. The verifyCompliance function checks opt-in thresholds and suppressed counts.

Error: 429 Too Many Requests

• What causes it: Exceeding CXone rate limits on schedule creation or contact list queries.
• How to fix it: Implement exponential backoff. CXone returns a Retry-After header that you must respect.
• Code showing the fix: The executeWithRetry function catches 429 responses, reads Retry-After, and retries up to three times with exponential delays.

Error: 503 Service Unavailable

• What causes it: Messaging gateway throttling or maintenance windows during peak burst execution.
• How to fix it: Reduce throttleRps in the burst configuration. Schedule bursts outside known maintenance windows. Enable autoRetryOnThrottle in the payload.
• Code showing the fix: The burstConfig payload includes autoRetryOnThrottle: true and queuePriority routing to prevent gateway rejection.

Official References

• NICE CXone Digital Messaging Schedules API
• NICE CXone OAuth 2.0 Client Credentials Flow
• NICE CXone Digital Events & Webhooks
• CXone Node.js SDK Reference
• Carrier Compliance & Opt-in Requirements