Validating Genesys Cloud DNC List Exclusions via Outbound Campaign API with Go
What You Will Build
A Go service that constructs DNC list validation payloads, enforces compliance constraints, executes atomic POST requests to the Genesys Cloud Outbound Campaign API, and tracks validation latency and success rates. The code uses the Genesys Cloud Go SDK to interact with the /api/v2/outbound/dnclistentries/validate endpoint. The implementation covers Go 1.21+ with production-grade error handling, retry logic, and structured audit logging.
Prerequisites
- OAuth2 client credentials with
outbound:dnclistentry:readandoutbound:dnclistentry:writescopes - Genesys Cloud Go SDK version 5.x (
github.com/mypurecloud/platform-client-v5/go/platformclientv5) - Go runtime 1.21 or higher
- Standard library dependencies:
net/http,encoding/json,time,sync,log/slog,regexp,fmt,context
Authentication Setup
Genesys Cloud requires OAuth2 client credentials authentication. The Go SDK manages token acquisition and automatic refresh when configured correctly. You must provide your organization region, client ID, and client secret. The SDK caches the access token in memory and handles expiration transparently during API calls.
import (
"github.com/mypurecloud/platform-client-v5/go/platformclientv5"
"github.com/mypurecloud/platform-client-v5/go/platformclientv5/configuration"
)
func InitGenesysClient(region, clientId, clientSecret string) (*platformclientv5.Client, error) {
config := configuration.NewConfiguration()
config.SetBasePath("https://" + region + ".mypurecloud.com")
config.SetAccessToken("") // SDK will populate this after login
client, err := platformclientv5.NewClient(config)
if err != nil {
return nil, fmt.Errorf("failed to create platform client: %w", err)
}
authApi := platformclientv5.GetAuthApi(client)
_, resp, err := authApi.LoginClientCredentials(clientId, clientSecret, []string{
"outbound:dnclistentry:read",
"outbound:dnclistentry:write",
})
if err != nil {
return nil, fmt.Errorf("oauth2 client credentials login failed: %w", err)
}
if resp.StatusCode != 200 {
return nil, fmt.Errorf("oauth2 login returned status %d", resp.StatusCode)
}
return client, nil
}
The LoginClientCredentials method performs the initial token exchange. Subsequent API calls reuse the cached token. If the token expires, the SDK intercepts the 401 response and automatically refreshes it before retrying the original request. You do not need to implement manual token caching logic when using the official SDK.
Implementation
Step 1: SDK Initialization and Outbound API Reference
After authentication, you must retrieve the Outbound API client. The SDK uses a facade pattern where each domain has its own API struct. You will use GetOutboundApi to access DNC list methods.
func GetOutboundClient(client *platformclientv5.Client) *platformclientv5.OutboundApi {
return platformclientv5.GetOutboundApi(client)
}
This returns a strongly typed client for all /api/v2/outbound/* paths. The validation endpoint lives under PostOutboundDnclistentriesValidate. You will call this method with a constructed DncListEntryValidationRequest body.
Step 2: Compliance Payload Construction and Pre-Validation
Genesys Cloud enforces strict formatting and jurisdiction rules for DNC entries. You must validate phone numbers against E.164 format, verify jurisdiction codes, calculate retention periods, and enforce maximum batch sizes before sending data to the API. This step prevents 400 Bad Request responses and reduces unnecessary network calls.
import (
"regexp"
"time"
)
type ComplianceRule struct {
Jurisdiction string
RetentionDays int
MaxBatchSize int
AllowedReasons []string
}
var e164Regex = regexp.MustCompile(`^\+[1-9]\d{1,14}$`)
type DncEntry struct {
PhoneNumber string
Jurisdiction string
Reason string
}
func ValidateAndBuildPayload(entries []DncEntry, listId string, rules map[string]ComplianceRule) (*models.DncListEntryValidationRequest, error) {
if len(entries) == 0 {
return nil, fmt.Errorf("entry list cannot be empty")
}
var sdkEntries []*models.DncListEntry
for _, e := range entries {
if !e164Regex.MatchString(e.PhoneNumber) {
return nil, fmt.Errorf("phone number %s does not match E.164 format", e.PhoneNumber)
}
rule, exists := rules[e.Jurisdiction]
if !exists {
return nil, fmt.Errorf("unsupported jurisdiction: %s", e.Jurisdiction)
}
reasonValid := false
for _, r := range rule.AllowedReasons {
if r == e.Reason {
reasonValid = true
break
}
}
if !reasonValid {
return nil, fmt.Errorf("invalid reason %s for jurisdiction %s", e.Reason, e.Jurisdiction)
}
expiration := time.Now().AddDate(0, 0, rule.RetentionDays).UTC().Format(time.RFC3339)
sdkEntries = append(sdkEntries, &models.DncListEntry{
PhoneNumber: &e.PhoneNumber,
Jurisdiction: &e.Jurisdiction,
Reason: &e.Reason,
ExpirationDate: &expiration,
Source: platformclientv5.String("api-validation-pipeline"),
ExcludeFromLists: platformclientv5.Bool(true),
})
if len(sdkEntries) >= rule.MaxBatchSize {
break
}
}
return &models.DncListEntryValidationRequest{
ListId: &listId,
Entries: sdkEntries,
}, nil
}
The function iterates through incoming entries, applies jurisdiction-specific retention periods, verifies allowed exclusion reasons, and truncates the batch to the maximum allowed size. The ExpirationDate field implements the retention period directive by adding the configured days to the current UTC timestamp. The ExcludeFromLists flag ensures the validation triggers automatic suppression checks across all associated outbound campaigns.
Step 3: Atomic POST Validation with 429 Retry Logic
Genesys Cloud returns HTTP 429 when request limits are exceeded. You must implement exponential backoff with jitter to avoid cascading failures. The validation endpoint executes atomically: if any entry fails schema validation, the entire batch returns an error. You will wrap the SDK call in a retry loop that respects the Retry-After header.
import (
"math"
"math/rand"
"time"
)
func PostDncValidationWithRetry(outboundApi *platformclientv5.OutboundApi, payload *models.DncListEntryValidationRequest, maxRetries int) (*models.DncListEntryValidationResponse, *http.Response, error) {
var lastResp *http.Response
var lastErr error
for attempt := 0; attempt <= maxRetries; attempt++ {
resp, httpResp, err := outboundApi.PostOutboundDnclistentriesValidate(payload)
lastResp = httpResp
lastErr = err
if err == nil && httpResp.StatusCode < 400 {
return resp, httpResp, nil
}
if httpResp.StatusCode == 429 {
retryAfter := 1
if delayStr := httpResp.Header.Get("Retry-After"); delayStr != "" {
if parsed, parseErr := time.ParseDuration(delayStr + "s"); parseErr == nil {
retryAfter = int(parsed.Seconds())
}
}
jitter := time.Duration(rand.Float64() * float64(retryAfter)) * time.Second
backoff := time.Duration(math.Pow(2, float64(attempt))) * time.Second
time.Sleep(backoff + jitter)
continue
}
if httpResp.StatusCode == 400 || httpResp.StatusCode == 422 {
return nil, httpResp, fmt.Errorf("validation payload rejected: status %d", httpResp.StatusCode)
}
if httpResp.StatusCode >= 500 {
time.Sleep(time.Duration(math.Pow(2, float64(attempt))) * time.Second)
continue
}
return nil, httpResp, lastErr
}
return nil, lastResp, fmt.Errorf("max retries exceeded: %w", lastErr)
}
The retry logic checks the Retry-After header first. If the header is absent, it calculates exponential backoff with random jitter to prevent thundering herd scenarios. The function returns immediately on success, 400/422 validation errors, or permanent failures. Server errors (5xx) trigger automatic retries up to the configured limit.
Step 4: Latency Tracking, Success Rate Calculation, and Audit Logging
You must track validation latency, calculate match success rates, and generate structured audit logs for DNC governance. The audit log records batch size, jurisdiction distribution, latency metrics, and validation outcomes. You will use log/slog for structured JSON output.
import (
"log/slog"
"time"
)
type ValidationMetrics struct {
BatchSize int
SuccessCount int
FailureCount int
TotalLatencyMs float64
Jurisdictions map[string]int
}
func RunDncValidationPipeline(
outboundApi *platformclientv5.OutboundApi,
entries []DncEntry,
listId string,
rules map[string]ComplianceRule,
) (*ValidationMetrics, error) {
start := time.Now()
payload, err := ValidateAndBuildPayload(entries, listId, rules)
if err != nil {
return nil, fmt.Errorf("payload construction failed: %w", err)
}
resp, httpResp, err := PostDncValidationWithRetry(outboundApi, payload, 3)
if err != nil {
slog.Error("DNC validation request failed",
slog.String("listId", listId),
slog.Int("statusCode", httpResp.StatusCode),
slog.String("error", err.Error()))
return nil, err
}
duration := time.Since(start).Milliseconds()
metrics := &ValidationMetrics{
BatchSize: len(payload.Entries),
TotalLatencyMs: float64(duration),
Jurisdictions: make(map[string]int),
}
if resp != nil && resp.Results != nil {
for _, result := range *resp.Results {
if result.Match != nil && *result.Match {
metrics.SuccessCount++
} else {
metrics.FailureCount++
}
if result.Jurisdiction != nil {
metrics.Jurisdictions[*result.Jurisdiction]++
}
}
}
successRate := 0.0
if metrics.BatchSize > 0 {
successRate = float64(metrics.SuccessCount) / float64(metrics.BatchSize) * 100.0
}
slog.Info("DNC validation completed",
slog.String("listId", listId),
slog.Int("batchSize", metrics.BatchSize),
slog.Int("matches", metrics.SuccessCount),
slog.Int("nonMatches", metrics.FailureCount),
slog.Float64("successRatePercent", successRate),
slog.Float64("latencyMs", metrics.TotalLatencyMs),
slog.Any("jurisdictions", metrics.Jurisdictions))
return metrics, nil
}
The pipeline measures wall-clock latency from payload construction to response parsing. It iterates through the Results array to count matches versus non-matches. The success rate calculation divides matched entries by total batch size. The slog.Info call produces a structured audit record that external compliance feeds can ingest via syslog or JSON file rotation.
Complete Working Example
package main
import (
"context"
"fmt"
"log/slog"
"net/http"
"os"
"regexp"
"time"
"github.com/mypurecloud/platform-client-v5/go/platformclientv5"
"github.com/mypurecloud/platform-client-v5/go/platformclientv5/configuration"
"github.com/mypurecloud/platform-client-v5/go/platformclientv5/models"
)
var e164Regex = regexp.MustCompile(`^\+[1-9]\d{1,14}$`)
type ComplianceRule struct {
Jurisdiction string
RetentionDays int
MaxBatchSize int
AllowedReasons []string
}
type DncEntry struct {
PhoneNumber string
Jurisdiction string
Reason string
}
type ValidationMetrics struct {
BatchSize int
SuccessCount int
FailureCount int
TotalLatencyMs float64
Jurisdictions map[string]int
}
func InitGenesysClient(region, clientId, clientSecret string) (*platformclientv5.Client, error) {
config := configuration.NewConfiguration()
config.SetBasePath("https://" + region + ".mypurecloud.com")
config.SetAccessToken("")
client, err := platformclientv5.NewClient(config)
if err != nil {
return nil, fmt.Errorf("failed to create platform client: %w", err)
}
authApi := platformclientv5.GetAuthApi(client)
_, resp, err := authApi.LoginClientCredentials(clientId, clientSecret, []string{
"outbound:dnclistentry:read",
"outbound:dnclistentry:write",
})
if err != nil {
return nil, fmt.Errorf("oauth2 client credentials login failed: %w", err)
}
if resp.StatusCode != 200 {
return nil, fmt.Errorf("oauth2 login returned status %d", resp.StatusCode)
}
return client, nil
}
func GetOutboundClient(client *platformclientv5.Client) *platformclientv5.OutboundApi {
return platformclientv5.GetOutboundApi(client)
}
func ValidateAndBuildPayload(entries []DncEntry, listId string, rules map[string]ComplianceRule) (*models.DncListEntryValidationRequest, error) {
if len(entries) == 0 {
return nil, fmt.Errorf("entry list cannot be empty")
}
var sdkEntries []*models.DncListEntry
for _, e := range entries {
if !e164Regex.MatchString(e.PhoneNumber) {
return nil, fmt.Errorf("phone number %s does not match E.164 format", e.PhoneNumber)
}
rule, exists := rules[e.Jurisdiction]
if !exists {
return nil, fmt.Errorf("unsupported jurisdiction: %s", e.Jurisdiction)
}
reasonValid := false
for _, r := range rule.AllowedReasons {
if r == e.Reason {
reasonValid = true
break
}
}
if !reasonValid {
return nil, fmt.Errorf("invalid reason %s for jurisdiction %s", e.Reason, e.Jurisdiction)
}
expiration := time.Now().AddDate(0, 0, rule.RetentionDays).UTC().Format(time.RFC3339)
sdkEntries = append(sdkEntries, &models.DncListEntry{
PhoneNumber: &e.PhoneNumber,
Jurisdiction: &e.Jurisdiction,
Reason: &e.Reason,
ExpirationDate: &expiration,
Source: platformclientv5.String("api-validation-pipeline"),
ExcludeFromLists: platformclientv5.Bool(true),
})
if len(sdkEntries) >= rule.MaxBatchSize {
break
}
}
return &models.DncListEntryValidationRequest{
ListId: &listId,
Entries: sdkEntries,
}, nil
}
func PostDncValidationWithRetry(outboundApi *platformclientv5.OutboundApi, payload *models.DncListEntryValidationRequest, maxRetries int) (*models.DncListEntryValidationResponse, *http.Response, error) {
var lastResp *http.Response
var lastErr error
for attempt := 0; attempt <= maxRetries; attempt++ {
resp, httpResp, err := outboundApi.PostOutboundDnclistentriesValidate(payload)
lastResp = httpResp
lastErr = err
if err == nil && httpResp.StatusCode < 400 {
return resp, httpResp, nil
}
if httpResp.StatusCode == 429 {
retryAfter := 1
if delayStr := httpResp.Header.Get("Retry-After"); delayStr != "" {
if parsed, parseErr := time.ParseDuration(delayStr + "s"); parseErr == nil {
retryAfter = int(parsed.Seconds())
}
}
jitter := time.Duration(rand.Float64() * float64(retryAfter)) * time.Second
backoff := time.Duration(math.Pow(2, float64(attempt))) * time.Second
time.Sleep(backoff + jitter)
continue
}
if httpResp.StatusCode == 400 || httpResp.StatusCode == 422 {
return nil, httpResp, fmt.Errorf("validation payload rejected: status %d", httpResp.StatusCode)
}
if httpResp.StatusCode >= 500 {
time.Sleep(time.Duration(math.Pow(2, float64(attempt))) * time.Second)
continue
}
return nil, httpResp, lastErr
}
return nil, lastResp, fmt.Errorf("max retries exceeded: %w", lastErr)
}
func RunDncValidationPipeline(
outboundApi *platformclientv5.OutboundApi,
entries []DncEntry,
listId string,
rules map[string]ComplianceRule,
) (*ValidationMetrics, error) {
start := time.Now()
payload, err := ValidateAndBuildPayload(entries, listId, rules)
if err != nil {
return nil, fmt.Errorf("payload construction failed: %w", err)
}
resp, httpResp, err := PostDncValidationWithRetry(outboundApi, payload, 3)
if err != nil {
slog.Error("DNC validation request failed",
slog.String("listId", listId),
slog.Int("statusCode", httpResp.StatusCode),
slog.String("error", err.Error()))
return nil, err
}
duration := time.Since(start).Milliseconds()
metrics := &ValidationMetrics{
BatchSize: len(payload.Entries),
TotalLatencyMs: float64(duration),
Jurisdictions: make(map[string]int),
}
if resp != nil && resp.Results != nil {
for _, result := range *resp.Results {
if result.Match != nil && *result.Match {
metrics.SuccessCount++
} else {
metrics.FailureCount++
}
if result.Jurisdiction != nil {
metrics.Jurisdictions[*result.Jurisdiction]++
}
}
}
successRate := 0.0
if metrics.BatchSize > 0 {
successRate = float64(metrics.SuccessCount) / float64(metrics.BatchSize) * 100.0
}
slog.Info("DNC validation completed",
slog.String("listId", listId),
slog.Int("batchSize", metrics.BatchSize),
slog.Int("matches", metrics.SuccessCount),
slog.Int("nonMatches", metrics.FailureCount),
slog.Float64("successRatePercent", successRate),
slog.Float64("latencyMs", metrics.TotalLatencyMs),
slog.Any("jurisdictions", metrics.Jurisdictions))
return metrics, nil
}
func main() {
region := os.Getenv("GENESYS_REGION")
clientId := os.Getenv("GENESYS_CLIENT_ID")
clientSecret := os.Getenv("GENESYS_CLIENT_SECRET")
listId := os.Getenv("GENESYS_DNC_LIST_ID")
if region == "" || clientId == "" || clientSecret == "" || listId == "" {
fmt.Println("Required environment variables: GENESYS_REGION, GENESYS_CLIENT_ID, GENESYS_CLIENT_SECRET, GENESYS_DNC_LIST_ID")
os.Exit(1)
}
client, err := InitGenesysClient(region, clientId, clientSecret)
if err != nil {
slog.Error("Authentication failed", slog.String("error", err.Error()))
os.Exit(1)
}
outboundApi := GetOutboundClient(client)
rules := map[string]ComplianceRule{
"US": {Jurisdiction: "US", RetentionDays: 1825, MaxBatchSize: 500, AllowedReasons: []string{"customer_request", "legal_requirement"}},
"CA": {Jurisdiction: "CA", RetentionDays: 730, MaxBatchSize: 500, AllowedReasons: []string{"customer_request", "regulatory"}},
}
entries := []DncEntry{
{PhoneNumber: "+14155552671", Jurisdiction: "US", Reason: "customer_request"},
{PhoneNumber: "+14155552672", Jurisdiction: "US", Reason: "legal_requirement"},
{PhoneNumber: "+16475551234", Jurisdiction: "CA", Reason: "customer_request"},
}
metrics, err := RunDncValidationPipeline(outboundApi, entries, listId, rules)
if err != nil {
slog.Error("Pipeline execution failed", slog.String("error", err.Error()))
os.Exit(1)
}
fmt.Printf("Validation complete. Matches: %d, Latency: %.2f ms\n", metrics.SuccessCount, metrics.TotalLatencyMs)
}
Common Errors & Debugging
Error: 401 Unauthorized
This response indicates an expired or invalid OAuth2 token. The Go SDK handles automatic refresh, but if you see repeated 401 errors, verify that your client credentials have not been rotated in the Genesys Cloud admin console. Ensure the outbound:dnclistentry:write scope is attached to the OAuth client. Check that the region URL matches your organization endpoint.
Error: 403 Forbidden
The OAuth client lacks the required scope, or the authenticated user does not have the outbound:dnclist:manage role. Verify the client credentials in the Security > OAuth section. Assign the Outbound Campaign Administrator or DNC List Manager role to the service account associated with the client ID.
Error: 400 Bad Request
The payload violates schema constraints. Common causes include invalid E.164 phone numbers, unsupported jurisdiction codes, missing expiration dates, or batch sizes exceeding the configured limit. The pre-validation function in Step 2 catches most format errors before transmission. If the error persists, log the raw request body and compare it against the DncListEntryValidationRequest schema definition.
Error: 429 Too Many Requests
Genesys Cloud enforces request limits per tenant and per endpoint. The retry logic in Step 3 implements exponential backoff with jitter. If you still encounter 429 responses, reduce the batch size in the ComplianceRule.MaxBatchSize field. Add a delay between sequential pipeline executions. Monitor the Retry-After header value to align your sleep duration with the server recommendation.