Configuring NICE CXone Outbound Call Recording Preferences via API with Go

What You Will Build

• A Go module that constructs, validates, and atomically applies outbound campaign recording configurations using the NICE CXone Outbound Campaign API.
• The implementation handles storage quota enforcement, compliance trigger verification, media server routing directives, and audio quality pipeline validation.
• The code runs in Go 1.21+ and uses only standard library packages for maximum portability.

Prerequisites

• NICE CXone OAuth2 client credentials with outbound:campaign:write, recording:manage, and compliance:read scopes
• CXone API version v2
• Go runtime version 1.21 or higher
• No external dependencies required. All networking, JSON marshaling, and concurrency utilities come from the standard library.

Authentication Setup

NICE CXone uses standard OAuth2 client credentials flow. The token endpoint varies by region. The example below implements a thread-safe token cache with automatic expiry handling.

package main

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

type OAuthConfig struct {
	ClientID     string
	ClientSecret string
	TenantURL    string
	Scopes       []string
}

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

type TokenCache struct {
	mu          sync.RWMutex
	token       *TokenResponse
	expiresAt   time.Time
	oauthConfig OAuthConfig
}

func NewTokenCache(cfg OAuthConfig) *TokenCache {
	return &TokenCache{oauthConfig: cfg}
}

func (c *TokenCache) GetToken(ctx context.Context) (string, error) {
	c.mu.RLock()
	if c.token != nil && time.Now().Before(c.expiresAt) {
		token := c.token.AccessToken
		c.mu.RUnlock()
		return token, nil
	}
	c.mu.RUnlock()

	c.mu.Lock()
	defer c.mu.Unlock()

	// Double-check after acquiring write lock
	if c.token != nil && time.Now().Before(c.expiresAt) {
		return c.token.AccessToken, nil
	}

	tokenURL := fmt.Sprintf("%s/oauth/token", c.oauthConfig.TenantURL)
	form := url.Values{}
	form.Set("grant_type", "client_credentials")
	form.Set("client_id", c.oauthConfig.ClientID)
	form.Set("client_secret", c.oauthConfig.ClientSecret)
	form.Set("scope", fmt.Sprintf("%s", c.oauthConfig.Scopes))

	req, err := http.NewRequestWithContext(ctx, http.MethodPost, tokenURL, bytes.NewBufferString(form.Encode()))
	if err != nil {
		return "", fmt.Errorf("failed to create token request: %w", err)
	}
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

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

	c.token = &tokenResp
	c.expiresAt = time.Now().Add(time.Duration(tokenResp.ExpiresIn) * time.Second)
	return c.token.AccessToken, nil
}

Implementation

Step 1: Construct Recording Config Payload

The CXone outbound campaign API expects a nested recording object. You must define the mode matrix, compliance triggers, storage limits, and media server routing directives explicitly. The payload below matches the PUT /api/v2/outbound/campaigns/{campaignId} schema.

type RecordingConfig struct {
	Enabled          bool              `json:"enabled"`
	ModeMatrix       string            `json:"mode"`
	Format           string            `json:"format"`
	StorageQuotaBytes int64            `json:"storageQuotaBytes"`
	ComplianceTriggers []string        `json:"complianceTriggers"`
	LegalHold        bool              `json:"legalHold"`
	AudioQualityPipeline AudioQuality  `json:"audioQuality"`
	MediaServerRouting MediaRouting    `json:"mediaServerRouting"`
}

type AudioQuality struct {
	Bitrate  int `json:"bitrate"`
	Channels int `json:"channels"`
}

type MediaRouting struct {
	PreferLowLatency bool `json:"preferLowLatency"`
	FallbackEnabled  bool `json:"fallbackEnabled"`
}

type CampaignUpdatePayload struct {
	Recording RecordingConfig `json:"recording"`
}

func BuildRecordingConfig(campaignID string, mode string, format string, quota int64, triggers []string, legalHold bool) CampaignUpdatePayload {
	return CampaignUpdatePayload{
		Recording: RecordingConfig{
			Enabled: true,
			ModeMatrix: mode,
			Format: format,
			StorageQuotaBytes: quota,
			ComplianceTriggers: triggers,
			LegalHold: legalHold,
			AudioQualityPipeline: AudioQuality{
				Bitrate: 16000,
				Channels: 1,
			},
			MediaServerRouting: MediaRouting{
				PreferLowLatency: true,
				FallbackEnabled: true,
			},
		},
	}
}

Step 2: Validate Config Schemas Against Infrastructure Constraints

Before sending the configuration, you must enforce platform limits. CXone enforces maximum storage quotas, valid recording modes, and audio pipeline constraints. Legal hold configurations require specific compliance triggers to prevent retention violations.

var (
	AllowedModes    = []string{"always", "on_demand", "never"}
	AllowedFormats  = []string{"wav", "mp3", "ogg"}
	MaxStorageBytes = int64(10737418240) // 10 GB
	AllowedBitrates = []int{8000, 16000, 32000}
)

func ValidateRecordingConfig(cfg CampaignUpdatePayload) error {
	r := cfg.Recording

	if !contains(AllowedModes, r.ModeMatrix) {
		return fmt.Errorf("invalid recording mode: %s. Must be one of %v", r.ModeMatrix, AllowedModes)
	}
	if !contains(AllowedFormats, r.Format) {
		return fmt.Errorf("invalid recording format: %s. Must be one of %v", r.Format, AllowedFormats)
	}
	if r.StorageQuotaBytes <= 0 || r.StorageQuotaBytes > MaxStorageBytes {
		return fmt.Errorf("storage quota %d exceeds maximum allowed %d or is invalid", r.StorageQuotaBytes, MaxStorageBytes)
	}
	if r.LegalHold {
		requiredTrigger := "legal_hold_retention"
		found := false
		for _, t := range r.ComplianceTriggers {
			if t == requiredTrigger {
				found = true
				break
			}
		}
		if !found {
			return fmt.Errorf("legal hold enabled but compliance trigger %s is missing", requiredTrigger)
		}
	}
	if !containsInt(AllowedBitrates, r.AudioQualityPipeline.Bitrate) {
		return fmt.Errorf("invalid audio bitrate: %d. Must be one of %v", r.AudioQualityPipeline.Bitrate, AllowedBitrates)
	}
	if r.AudioQualityPipeline.Channels != 1 && r.AudioQualityPipeline.Channels != 2 {
		return fmt.Errorf("invalid audio channels: %d. Must be 1 or 2", r.AudioQualityPipeline.Channels)
	}
	return nil
}

func contains(slice []string, val string) bool {
	for _, s := range slice {
		if s == val {
			return true
		}
	}
	return false
}

func containsInt(slice []int, val int) bool {
	for _, s := range slice {
		if s == val {
			return true
		}
	}
	return false
}

Step 3: Apply Configuration via Atomic PUT with Retry Logic

The outbound campaign update endpoint supports atomic updates. You must handle HTTP 429 rate limits with exponential backoff. The request includes format verification headers and expects a 200 OK with the updated campaign object.

type CXoneClient struct {
	BaseURL     string
	TokenCache  *TokenCache
	HTTPClient  *http.Client
}

func (c *CXoneClient) UpdateCampaignRecording(ctx context.Context, campaignID string, payload CampaignUpdatePayload) error {
	if err := ValidateRecordingConfig(payload); err != nil {
		return fmt.Errorf("validation failed: %w", err)
	}

	endpoint := fmt.Sprintf("%s/api/v2/outbound/campaigns/%s", c.BaseURL, campaignID)
	bodyBytes, err := json.Marshal(payload)
	if err != nil {
		return fmt.Errorf("failed to marshal payload: %w", err)
	}

	maxRetries := 3
	for attempt := 0; attempt <= maxRetries; attempt++ {
		token, err := c.TokenCache.GetToken(ctx)
		if err != nil {
			return fmt.Errorf("failed to retrieve token: %w", err)
		}

		req, err := http.NewRequestWithContext(ctx, http.MethodPut, endpoint, bytes.NewBuffer(bodyBytes))
		if err != nil {
			return fmt.Errorf("failed to create request: %w", err)
		}
		req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", token))
		req.Header.Set("Content-Type", "application/json")
		req.Header.Set("Accept", "application/json")
		req.Header.Set("X-Format-Verification", "strict")

		resp, err := c.HTTPClient.Do(req)
		if err != nil {
			return fmt.Errorf("request failed: %w", err)
		}
		defer resp.Body.Close()

		if resp.StatusCode == http.StatusTooManyRequests {
			backoff := time.Duration(math.Pow(2, float64(attempt))) * time.Second
			log.Printf("Received 429. Retrying in %v", backoff)
			time.Sleep(backoff)
			continue
		}

		if resp.StatusCode != http.StatusOK {
			body, _ := io.ReadAll(resp.Body)
			return fmt.Errorf("update failed with status %d: %s", resp.StatusCode, string(body))
		}

		log.Printf("Campaign %s recording configuration applied successfully", campaignID)
		return nil
	}

	return fmt.Errorf("max retries exceeded for campaign %s", campaignID)
}

Step 4: Synchronize Config Events and Track Latency

After successful application, you must notify external compliance systems via webhook, record activation latency, and generate an audit log entry. The tracking metrics feed into telephony efficiency dashboards.

type AuditLog struct {
	Timestamp  time.Time `json:"timestamp"`
	CampaignID string    `json:"campaignId"`
	Action     string    `json:"action"`
	Status     string    `json:"status"`
	LatencyMs  int64     `json:"latencyMs"`
	ConfigHash string    `json:"configHash"`
}

type WebhookPayload struct {
	Event   string    `json:"event"`
	Tenant  string    `json:"tenant"`
	Payload AuditLog  `json:"payload"`
}

func (c *CXoneClient) SyncAndTrack(ctx context.Context, campaignID string, payload CampaignUpdatePayload, webhookURL string) error {
	startTime := time.Now()

	err := c.UpdateCampaignRecording(ctx, campaignID, payload)
	latency := time.Since(startTime).Milliseconds()

	status := "success"
	if err != nil {
		status = "failure"
	}

	payloadBytes, _ := json.Marshal(payload)
	hash := fmt.Sprintf("%x", sha256.Sum256(payloadBytes))

	audit := AuditLog{
		Timestamp:  time.Now().UTC(),
		CampaignID: campaignID,
		Action:     "recording_config_update",
		Status:     status,
		LatencyMs:  latency,
		ConfigHash: hash,
	}

	log.Printf("Audit: %s | Latency: %dms | Hash: %s | Status: %s", campaignID, latency, hash, status)

	if webhookURL != "" {
		go c.sendWebhook(ctx, webhookURL, audit)
	}

	return err
}

func (c *CXoneClient) sendWebhook(ctx context.Context, webhookURL string, audit AuditLog) {
	webhookPayload := WebhookPayload{
		Event:   "outbound_recording_config_applied",
		Tenant:  "nice_cxone",
		Payload: audit,
	}

	body, _ := json.Marshal(webhookPayload)
	req, err := http.NewRequestWithContext(ctx, http.MethodPost, webhookURL, bytes.NewBuffer(body))
	if err != nil {
		log.Printf("Webhook request creation failed: %v", err)
		return
	}
	req.Header.Set("Content-Type", "application/json")

	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		log.Printf("Webhook delivery failed: %v", err)
		return
	}
	defer resp.Body.Close()

	if resp.StatusCode >= 200 && resp.StatusCode < 300 {
		log.Printf("Compliance webhook delivered successfully")
	} else {
		log.Printf("Compliance webhook returned %d", resp.StatusCode)
	}
}

Complete Working Example

The following script initializes the client, constructs a compliant recording configuration, validates constraints, applies the update atomically, and triggers compliance synchronization.

package main

import (
	"context"
	"log"
	"net/http"
	"os"
	"time"
)

func main() {
	// Load credentials from environment variables
	clientID := os.Getenv("CXONE_CLIENT_ID")
	clientSecret := os.Getenv("CXONE_CLIENT_SECRET")
	tenantURL := os.Getenv("CXONE_TENANT_URL") // e.g., https://api-us-1.nice-incontact.com
	campaignID := os.Getenv("CXONE_CAMPAIGN_ID")
	webhookURL := os.Getenv("COMPLIANCE_WEBHOOK_URL")

	if clientID == "" || clientSecret == "" || tenantURL == "" || campaignID == "" {
		log.Fatal("Missing required environment variables: CXONE_CLIENT_ID, CXONE_CLIENT_SECRET, CXONE_TENANT_URL, CXONE_CAMPAIGN_ID")
	}

	oauthConfig := OAuthConfig{
		ClientID:     clientID,
		ClientSecret: clientSecret,
		TenantURL:    tenantURL,
		Scopes:       []string{"outbound:campaign:write", "recording:manage", "compliance:read"},
	}

	tokenCache := NewTokenCache(oauthConfig)

	client := &CXoneClient{
		BaseURL:    tenantURL,
		TokenCache: tokenCache,
		HTTPClient: &http.Client{Timeout: 30 * time.Second},
	}

	ctx := context.Background()

	// Construct configuration payload
	payload := BuildRecordingConfig(
		campaignID,
		"always",
		"wav",
		5368709120, // 5 GB
		[]string{"gdpr_consent", "pci_dss_redaction", "legal_hold_retention"},
		true,
	)

	log.Printf("Starting recording configuration update for campaign %s", campaignID)

	err := client.SyncAndTrack(ctx, campaignID, payload, webhookURL)
	if err != nil {
		log.Fatalf("Configuration update failed: %v", err)
	}

	log.Printf("Outbound recording configuration applied successfully")
}

Common Errors & Debugging

Error: 401 Unauthorized

• Cause: OAuth token expired, invalid client credentials, or missing required scopes.
• Fix: Verify CXONE_CLIENT_ID and CXONE_CLIENT_SECRET. Ensure the token cache refreshes before expiry. Confirm the client has outbound:campaign:write scope assigned in the CXone admin console.
• Code Fix: The TokenCache.GetToken method automatically refreshes expired tokens. If 401 persists, log the raw token response to verify scope assignment.

Error: 403 Forbidden

• Cause: The authenticated user lacks campaign modification permissions or the campaign is locked by another process.
• Fix: Assign the Outbound Campaign Admin role to the OAuth client user. Verify the campaign status is active or draft before applying updates.
• Code Fix: Check response headers for X-Error-Code. If locked, implement a polling retry mechanism before PUT.

Error: 400 Bad Request

• Cause: Payload schema mismatch, invalid recording mode, or storage quota exceeds tenant limits.
• Fix: Run ValidateRecordingConfig before sending. Verify storageQuotaBytes does not exceed your tenant’s allocated media storage. Ensure legalHold includes the legal_hold_retention trigger.
• Code Fix: The validation function returns descriptive errors. Log the exact field causing failure and adjust the payload matrix accordingly.

Error: 429 Too Many Requests

• Cause: Rate limit cascade from rapid campaign updates or concurrent outbound scaling events.
• Fix: Implement exponential backoff. The provided UpdateCampaignRecording method handles this automatically with three retry attempts.
• Code Fix: Increase maxRetries if your scaling pipeline generates burst traffic. Add jitter to backoff duration to prevent thundering herd scenarios.

Error: 409 Conflict

• Cause: Concurrent modification of the same campaign configuration by another API client or admin console user.
• Fix: Implement optimistic concurrency control by reading the campaign, applying changes locally, and sending the update with the original ETag header.
• Code Fix: Add req.Header.Set("If-Match", existingETag) before the PUT request. Handle 409 by re-fetching the campaign and retrying the merge.

Official References

• NICE CXone Outbound Campaign API Documentation
• NICE CXone OAuth2 Authentication Guide
• NICE CXone Recording & Compliance Schema Reference
• NICE CXone API Rate Limiting & Retry Policies