Configuring NICE CXone Outbound Campaign Preview Settings via REST API with Go

What You Will Build

• A Go service that constructs, validates, and activates NICE CXone outbound campaign preview configurations with full error handling and operational tracking.
• Uses CXone REST API v2 endpoints for campaigns, contact lists, suppressions, and webhooks.
• Language: Go 1.21+ with standard library HTTP client, JSON encoding, and concurrency primitives.

Prerequisites

• OAuth2 Client Credentials grant configured in CXone Admin Console
• Required scopes: campaign:write, contactlist:read, suppressions:read, webhook:write, outbound:read
• CXone API v2 runtime environment
• Go 1.21 or newer installed
• No external dependencies required; standard library only

Authentication Setup

CXone uses OAuth2 Client Credentials flow. Tokens expire after 10 minutes and must be cached to avoid unnecessary network calls. The following implementation includes token caching, mutex protection, and automatic refresh on expiration.

package main

import (
	"context"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"sync"
	"time"
)

type OAuthConfig struct {
	ClientID     string
	ClientSecret string
	BaseURL      string
}

type TokenResponse struct {
	AccessToken string `json:"access_token"`
	ExpiresIn   int64  `json:"expires_in"`
	TokenType   string `json:"token_type"`
}

type TokenCache struct {
	mu          sync.RWMutex
	token       string
	expiresAt   time.Time
}

func (c *TokenCache) GetOrRefresh(ctx context.Context, cfg OAuthConfig) (string, error) {
	c.mu.RLock()
	if time.Now().Before(c.expiresAt) {
		tok := c.token
		c.mu.RUnlock()
		return tok, nil
	}
	c.mu.RUnlock()

	return c.fetchToken(ctx, cfg)
}

func (c *TokenCache) fetchToken(ctx context.Context, cfg OAuthConfig) (string, error) {
	data := map[string]string{
		"grant_type":    "client_credentials",
		"client_id":     cfg.ClientID,
		"client_secret": cfg.ClientSecret,
	}

	payload := &url.Values{}
	for k, v := range data {
		payload.Set(k, v)
	}

	req, err := http.NewRequestWithContext(ctx, http.MethodPost, fmt.Sprintf("%s/api/v2/oauth/token", cfg.BaseURL), strings.NewReader(payload.Encode()))
	if err != nil {
		return "", fmt.Errorf("failed to create token request: %w", err)
	}
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

	client := &http.Client{Timeout: 10 * time.Second}
	resp, err := client.Do(req)
	if err != nil {
		return "", fmt.Errorf("token request failed: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		body, _ := io.ReadAll(resp.Body)
		return "", fmt.Errorf("token request returned %d: %s", resp.StatusCode, string(body))
	}

	var tr TokenResponse
	if err := json.NewDecoder(resp.Body).Decode(&tr); err != nil {
		return "", fmt.Errorf("failed to decode token response: %w", err)
	}

	c.mu.Lock()
	c.token = tr.AccessToken
	c.expiresAt = time.Now().Add(time.Duration(tr.ExpiresIn) * time.Second)
	c.mu.Unlock()

	return tr.AccessToken, nil
}

OAuth Scopes Required: campaign:write, contactlist:read, suppressions:read, webhook:write, outbound:read

Implementation

Step 1: Validate License Tier Constraints and Concurrent Preview Limits

CXone does not expose license tier boundaries via public API. The validation is implemented as a configurable business rule that queries active preview campaigns and enforces a concurrent session limit. This prevents scheduling conflicts and respects tier boundaries.

type CampaignConstraint struct {
	MaxConcurrentPreviews int
}

func ValidatePreviewConstraints(ctx context.Context, baseURL, token string, constraints CampaignConstraint) error {
	// Query active preview campaigns
	url := fmt.Sprintf("%s/api/v2/outbound/campaigns?limit=1000&type=preview&status=active", baseURL)
	req, _ := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
	req.Header.Set("Authorization", "Bearer "+token)

	client := &http.Client{Timeout: 15 * time.Second}
	resp, err := client.Do(req)
	if err != nil {
		return fmt.Errorf("constraint validation request failed: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode == http.StatusTooManyRequests {
		time.Sleep(2 * time.Second)
		resp, err = client.Do(req)
		if err != nil || resp.StatusCode == http.StatusTooManyRequests {
			return fmt.Errorf("rate limited during constraint validation")
		}
	}

	if resp.StatusCode != http.StatusOK {
		return fmt.Errorf("constraint validation returned %d", resp.StatusCode)
	}

	var result struct {
		Entity []struct {
			ID string `json:"id"`
		} `json:"entity"`
	}
	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
		return fmt.Errorf("failed to decode campaign list: %w", err)
	}

	if len(result.Entity) >= constraints.MaxConcurrentPreviews {
		return fmt.Errorf("concurrent preview limit reached: %d/%d", len(result.Entity), constraints.MaxConcurrentPreviews)
	}
	return nil
}

Step 2: Construct Preview Configuration Payload

The preview payload requires contact list references, dialing rule overrides, and agent assignment directives. The schema must match CXone v2 outbound campaign structure exactly.

type PreviewConfig struct {
	Name          string            `json:"name"`
	Type          string            `json:"type"`
	ContactLists  []ContactListRef  `json:"contactLists"`
	DialingRules  DialingRules      `json:"dialingRules"`
	AgentDirectives []AgentDirective `json:"agentDirectives"`
	PreviewSettings PreviewSettings `json:"previewSettings"`
}

type ContactListRef struct {
	ID   string `json:"id"`
	Type string `json:"type"`
}

type DialingRules struct {
	Strategy        string `json:"strategy"`
	MaxAttempts     int    `json:"maxAttempts"`
	CallbackEnabled bool   `json:"callbackEnabled"`
}

type AgentDirective struct {
	QueueID           string `json:"queueId"`
	SkillRequirement  string `json:"skillRequirement"`
	AgentCount        int    `json:"agentCount"`
}

type PreviewSettings struct {
	PreviewDialingMode string `json:"previewDialingMode"`
	AgentPromptEnabled bool   `json:"agentPromptEnabled"`
}

func BuildPreviewPayload(contactListID, queueID string) PreviewConfig {
	return PreviewConfig{
		Name:          "Automated Preview Campaign",
		Type:          "preview",
		ContactLists:  []ContactListRef{{ID: contactListID, Type: "contactlist"}},
		DialingRules: DialingRules{
			Strategy:        "preview",
			MaxAttempts:     1,
			CallbackEnabled: false,
		},
		AgentDirectives: []AgentDirective{
			{QueueID: queueID, SkillRequirement: "outbound_preview", AgentCount: 5},
		},
		PreviewSettings: PreviewSettings{
			PreviewDialingMode: "manual",
			AgentPromptEnabled: true,
		},
	}
}

Step 3: Contact Filtering and Suppression Cross-Referencing

Before activation, the pipeline fetches eligible contacts, applies demographic filters, and cross-references against suppression lists. This isolates target segments and validates outreach eligibility.

type Contact struct {
	ID       string                 `json:"id"`
	Fields   map[string]interface{} `json:"fields"`
}

type SuppressionEntry struct {
	ID          string `json:"id"`
	PhoneNumber string `json:"phoneNumber"`
	Reason      string `json:"reason"`
}

func FilterAndValidateContacts(ctx context.Context, baseURL, token, contactListID string, targetRegion string) ([]string, error) {
	// Fetch contacts with pagination
	var eligibleContacts []string
	page := 1
	limit := 250

	for {
		url := fmt.Sprintf("%s/api/v2/outbound/contactlists/%s/contacts?limit=%d&page=%d", baseURL, contactListID, limit, page)
		req, _ := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
		req.Header.Set("Authorization", "Bearer "+token)

		client := &http.Client{Timeout: 20 * time.Second}
		resp, err := client.Do(req)
		if err != nil {
			return nil, fmt.Errorf("contact fetch failed: %w", err)
		}
		if resp.StatusCode == http.StatusTooManyRequests {
			time.Sleep(2 * time.Second)
			continue
		}
		defer resp.Body.Close()

		var result struct {
			Entity []Contact `json:"entity"`
			Next   string    `json:"nextPageUri"`
		}
		if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
			return nil, fmt.Errorf("contact decode failed: %w", err)
		}

		for _, c := range result.Entity {
			if region, ok := c.Fields["region"].(string); ok && region == targetRegion {
				eligibleContacts = append(eligibleContacts, c.ID)
			}
		}

		if result.Next == "" {
			break
		}
		page++
	}

	// Cross-reference suppressions
	suppURL := fmt.Sprintf("%s/api/v2/outbound/suppressions?limit=1000", baseURL)
	req, _ := http.NewRequestWithContext(ctx, http.MethodGet, suppURL, nil)
	req.Header.Set("Authorization", "Bearer "+token)
	resp, err := client.Do(req)
	if err != nil {
		return nil, fmt.Errorf("suppression fetch failed: %w", err)
	}
	defer resp.Body.Close()

	var suppResult struct {
		Entity []SuppressionEntry `json:"entity"`
	}
	if err := json.NewDecoder(resp.Body).Decode(&suppResult); err != nil {
		return nil, fmt.Errorf("suppression decode failed: %w", err)
	}

	suppressedIDs := make(map[string]bool)
	for _, s := range suppResult.Entity {
		suppressedIDs[s.PhoneNumber] = true
	}

	var finalContacts []string
	for _, id := range eligibleContacts {
		if !suppressedIDs[id] {
			finalContacts = append(finalContacts, id)
		}
	}

	return finalContacts, nil
}

Step 4: Activate Preview with Optimistic Locking and State Synchronization

CXone supports optimistic locking via the If-Match header using the campaign version. The implementation performs an atomic PUT, handles 412 Precondition Failed, and synchronizes state automatically.

func ActivatePreview(ctx context.Context, baseURL, token, campaignID, etag string, payload PreviewConfig) (string, error) {
	body, err := json.Marshal(payload)
	if err != nil {
		return "", fmt.Errorf("payload marshal failed: %w", err)
	}

	url := fmt.Sprintf("%s/api/v2/outbound/campaigns/%s", baseURL, campaignID)
	req, _ := http.NewRequestWithContext(ctx, http.MethodPut, url, bytes.NewReader(body))
	req.Header.Set("Authorization", "Bearer "+token)
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("If-Match", etag)

	client := &http.Client{Timeout: 15 * time.Second}
	resp, err := client.Do(req)
	if err != nil {
		return "", fmt.Errorf("activation request failed: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode == http.StatusPreconditionFailed {
		return "", fmt.Errorf("optimistic lock conflict: campaign modified by another process")
	}
	if resp.StatusCode == http.StatusTooManyRequests {
		time.Sleep(2 * time.Second)
		resp, err = client.Do(req)
		if err != nil || resp.StatusCode == http.StatusTooManyRequests {
			return "", fmt.Errorf("rate limited during activation")
		}
	}
	if resp.StatusCode != http.StatusOK {
		return "", fmt.Errorf("activation returned %d", resp.StatusCode)
	}

	var newVersion struct {
		Version int    `json:"version"`
		Status  string `json:"status"`
	}
	if err := json.NewDecoder(resp.Body).Decode(&newVersion); err != nil {
		return "", fmt.Errorf("response decode failed: %w", err)
	}

	return fmt.Sprintf("version:%d", newVersion.Version), nil
}

Step 5: Webhook Callbacks, Latency Tracking, and Audit Logging

The configurator registers a webhook for preview launch events, tracks activation latency, and writes structured audit logs for regulatory compliance.

type AuditLog struct {
	Timestamp    string `json:"timestamp"`
	Action       string `json:"action"`
	CampaignID   string `json:"campaignId"`
	Status       string `json:"status"`
	LatencyMs    int64  `json:"latencyMs"`
	SuccessRate  float64 `json:"successRate"`
}

func RegisterWebhookAndLog(ctx context.Context, baseURL, token, callbackURL, campaignID string, start time.Time) error {
	webhookPayload := map[string]interface{}{
		"name":        "Preview QA Sync",
		"enabled":     true,
		"eventFilter": "campaign.preview.activated",
		"uri":         callbackURL,
		"method":      "POST",
	}

	body, _ := json.Marshal(webhookPayload)
	req, _ := http.NewRequestWithContext(ctx, http.MethodPost, fmt.Sprintf("%s/api/v2/webhooks", baseURL), bytes.NewReader(body))
	req.Header.Set("Authorization", "Bearer "+token)
	req.Header.Set("Content-Type", "application/json")

	client := &http.Client{Timeout: 10 * time.Second}
	resp, err := client.Do(req)
	if err != nil {
		return fmt.Errorf("webhook registration failed: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusCreated && resp.StatusCode != http.StatusOK {
		return fmt.Errorf("webhook registration returned %d", resp.StatusCode)
	}

	latency := time.Since(start).Milliseconds()
	logEntry := AuditLog{
		Timestamp:   time.Now().UTC().Format(time.RFC3339),
		Action:      "preview_activated",
		CampaignID:  campaignID,
		Status:      "success",
		LatencyMs:   latency,
		SuccessRate: 1.0,
	}

	logJSON, _ := json.MarshalIndent(logEntry, "", "  ")
	fmt.Println(string(logJSON))

	return nil
}

Complete Working Example

The following module combines all components into a runnable preview configurator. Replace placeholder credentials and identifiers before execution.

package main

import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"net/url"
	"strings"
	"time"
)

func main() {
	ctx, cancel := context.WithTimeout(context.Background(), 60*time.Second)
	defer cancel()

	cfg := OAuthConfig{
		ClientID:     "YOUR_CLIENT_ID",
		ClientSecret: "YOUR_CLIENT_SECRET",
		BaseURL:      "https://your-instance.my.cxone.com",
	}

	cache := &TokenCache{}
	token, err := cache.GetOrRefresh(ctx, cfg)
	if err != nil {
		fmt.Println("Authentication failed:", err)
		return
	}

	constraints := CampaignConstraint{MaxConcurrentPreviews: 3}
	if err := ValidatePreviewConstraints(ctx, cfg.BaseURL, token, constraints); err != nil {
		fmt.Println("Constraint validation failed:", err)
		return
	}

	contactListID := "YOUR_CONTACT_LIST_ID"
	queueID := "YOUR_QUEUE_ID"
	targetRegion := "NA-EAST"

	eligibleContacts, err := FilterAndValidateContacts(ctx, cfg.BaseURL, token, contactListID, targetRegion)
	if err != nil {
		fmt.Println("Contact filtering failed:", err)
		return
	}
	fmt.Printf("Eligible contacts after filtering: %d\n", len(eligibleContacts))

	payload := BuildPreviewPayload(contactListID, queueID)

	campaignID := "YOUR_CAMPAIGN_ID"
	etag := "version:1"

	start := time.Now()
	newVersion, err := ActivatePreview(ctx, cfg.BaseURL, token, campaignID, etag, payload)
	if err != nil {
		fmt.Println("Activation failed:", err)
		return
	}
	fmt.Println("Activation successful. New version:", newVersion)

	callbackURL := "https://your-qa-platform.com/api/cxone/preview-callback"
	if err := RegisterWebhookAndLog(ctx, cfg.BaseURL, token, callbackURL, campaignID, start); err != nil {
		fmt.Println("Webhook/log sync failed:", err)
		return
	}
	fmt.Println("Preview configurator completed successfully.")
}

Common Errors & Debugging

Error: 401 Unauthorized

• Cause: Expired OAuth token, incorrect client credentials, or missing Authorization header.
• Fix: Verify token cache expiration logic. Ensure the Bearer prefix is included. Check client ID and secret in CXone Admin Console.
• Code Fix: The TokenCache.GetOrRefresh method automatically refreshes tokens before expiration. Add explicit expiration check if running long-lived processes.

Error: 403 Forbidden

• Cause: Missing OAuth scopes or insufficient user permissions for outbound campaigns.
• Fix: Grant campaign:write, contactlist:read, suppressions:read, webhook:write, and outbound:read scopes to the OAuth client. Verify the service account has Outbound Campaign Administrator role.

Error: 412 Precondition Failed

• Cause: Optimistic lock conflict. The campaign version changed between GET and PUT operations.
• Fix: Fetch the latest version via GET /api/v2/outbound/campaigns/{id} and update the If-Match header before retrying the PUT request.
• Code Fix: Implement a retry loop that refreshes the ETag on 412 responses.

Error: 429 Too Many Requests

• Cause: Rate limit exceeded. CXone enforces per-client and per-endpoint throttling.
• Fix: Implement exponential backoff. The provided code includes a 2-second sleep and retry for 429 responses. For production, use a jitter-based backoff strategy.

Error: 400 Bad Request

• Cause: Invalid JSON schema, missing required fields, or malformed contact list references.
• Fix: Validate payload against CXone v2 campaign schema. Ensure type is set to preview, contactLists contains valid UUIDs, and agentDirectives references existing queues.

Official References

• CXone OAuth2 Authentication
• CXone Outbound Campaigns API
• CXone Contact Lists API
• CXone Suppressions API
• CXone Webhooks API