Retrieving Genesys Cloud Web Messaging History via Guest API in Go

What You Will Build

A production-grade Go module that fetches paginated Web Messaging conversation history, enforces gateway constraints and depth limits, validates message schemas and media URLs, synchronizes batches to external archives via webhooks, and emits structured audit logs with latency tracking.
This tutorial uses the Genesys Cloud Public Messaging Guest API (/api/v2/public/messaging/{organizationId}/{domainId}/{conversationId}/messages).
The implementation is written in Go 1.21+ using standard library packages and modern concurrency patterns.

Prerequisites

• OAuth Client Type & Scopes: None. The Guest/Public Messaging API does not require OAuth authentication. It relies on valid routing identifiers (organizationId, domainId, conversationId).
• API Version: Genesys Cloud REST API v2 (Public Messaging)
• Language/Runtime: Go 1.21 or later
• External Dependencies: None. The solution uses only the Go standard library (net/http, encoding/json, context, time, sync, log/slog, fmt, net/url, crypto/tls).

Authentication Setup

The Genesys Cloud Guest API operates without bearer tokens. Requests are routed using the organizationId, domainId, and conversationId path parameters. If you require internal API access instead, you would attach an Authorization: Bearer <token> header with the webmessaging:view scope. For this tutorial, we configure the HTTP client to skip TLS verification only for testing against staging environments, and we enforce strict timeout and retry boundaries to prevent bandwidth exhaustion.

package main

import (
	"crypto/tls"
	"net/http"
	"time"
)

// BuildGuestClient creates an HTTP client tuned for Guest API retrieval.
// It enforces strict timeouts to prevent hanging connections during scaling.
func BuildGuestClient() *http.Client {
	return &http.Client{
		Timeout: 15 * time.Second,
		Transport: &http.Transport{
			TLSClientConfig: &tls.Config{
				// Set to true only for Genesys Cloud staging/sandbox environments.
				// Production environments must use valid certificates.
				InsecureSkipVerify: false,
			},
			MaxIdleConns:        10,
			MaxIdleConnsPerHost: 5,
			IdleConnTimeout:     30 * time.Second,
		},
	}
}

Implementation

Step 1: Configuration & Constraint Validation

The messaging gateway enforces strict payload limits. We define a configuration struct that validates pageSize against the gateway maximum (50), sets a maxDepth to prevent infinite pagination loops, and configures type filtering. The validation runs before any network call.

package main

import (
	"errors"
	"fmt"
	"time"
)

type RetrieverConfig struct {
	OrganizationID string
	DomainID       string
	ConversationID string
	BaseURL        string
	PageSize       int
	MaxDepth       int
	MessageTypes   []string // Filter directives: "text", "image", "file", "button"
	WebhookURL     string
	Cache          map[string]Message // In-memory cache keyed by message ID
}

type Message struct {
	ID        string    `json:"id"`
	Type      string    `json:"type"`
	Text      string    `json:"text,omitempty"`
	Timestamp time.Time `json:"timestamp"`
	Media     *Media    `json:"media,omitempty"`
}

type Media struct {
	URL  string `json:"url"`
	Name string `json:"name"`
}

type PaginationMeta struct {
	NextPageToken string `json:"nextPageToken"`
	PreviousPageToken string `json:"previousPageToken"`
	PageSize      int    `json:"pageSize"`
	Total         int    `json:"total"`
}

func (c *RetrieverConfig) Validate() error {
	if c.OrganizationID == "" || c.DomainID == "" || c.ConversationID == "" {
		return errors.New("organizationId, domainId, and conversationId are required")
	}
	if c.PageSize <= 0 || c.PageSize > 50 {
		return fmt.Errorf("pageSize must be between 1 and 50 (gateway constraint)")
	}
	if c.MaxDepth <= 0 {
		return fmt.Errorf("maxDepth must be greater than 0 to prevent bandwidth exhaustion")
	}
	return nil
}

Step 2: Atomic GET Operations with Pagination & Retry

Each page fetch is an atomic GET request. We implement exponential backoff for 429 Too Many Requests responses. The pagination token matrix is handled by tracking nextPageToken. We verify the response format against the expected schema before processing.

package main

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

type PageResponse struct {
	Entities []Message    `json:"entities"`
	Meta     PaginationMeta `json:"meta"`
}

func fetchPage(ctx context.Context, client *http.Client, cfg *RetrieverConfig, pageToken string) (*PageResponse, error) {
	endpoint := fmt.Sprintf("%s/api/v2/public/messaging/%s/%s/%s/messages",
		cfg.BaseURL, cfg.OrganizationID, cfg.DomainID, cfg.ConversationID)

	params := url.Values{}
	params.Set("pageSize", fmt.Sprintf("%d", cfg.PageSize))
	if pageToken != "" {
		params.Set("nextPageToken", pageToken)
	}
	endpoint = endpoint + "?" + params.Encode()

	var lastErr error
	for attempt := 0; attempt < 5; attempt++ {
		req, err := http.NewRequestWithContext(ctx, http.MethodGet, endpoint, nil)
		if err != nil {
			return nil, fmt.Errorf("failed to create request: %w", err)
		}
		req.Header.Set("Accept", "application/json")

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

		if resp.StatusCode == http.StatusTooManyRequests {
			waitTime := time.Duration(1<<uint(attempt)) * time.Second
			fmt.Printf("Rate limited (429). Retrying in %v...\n", waitTime)
			time.Sleep(waitTime)
			lastErr = errors.New("429 Too Many Requests")
			continue
		}

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

		var page PageResponse
		if err := json.NewDecoder(resp.Body).Decode(&page); err != nil {
			return nil, fmt.Errorf("format verification failed: invalid JSON schema: %w", err)
		}
		return &page, nil
	}

	return nil, fmt.Errorf("max retries exceeded: %w", lastErr)
}

Step 3: Validation Pipeline, Cache Population, & Metrics

We process each page atomically. The pipeline validates timestamp ordering, filters by message type, checks media URL expiry patterns, populates the cache, and tracks latency. Webhook synchronization occurs per batch to maintain alignment with external archiving systems.

package main

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

type AuditLog struct {
	Event     string    `json:"event"`
	Timestamp time.Time `json:"timestamp"`
	PageToken string    `json:"pageToken,omitempty"`
	MessageCount int    `json:"messageCount"`
	LatencyMs int64     `json:"latencyMs"`
	Error     string    `json:"error,omitempty"`
}

func processPage(ctx context.Context, client *http.Client, cfg *RetrieverConfig, page *PageResponse, pageToken string, auditLogger func(AuditLog)) error {
	start := time.Now()
	auditLogger(AuditLog{Event: "page_fetch_start", PageToken: pageToken, Timestamp: time.Now()})

	var validMessages []Message
	var lastTimestamp time.Time
	isFirst := true

	for idx, msg := range page.Entities {
		// Timestamp ordering validation
		if !isFirst && !msg.Timestamp.After(lastTimestamp) {
			fmt.Printf("Warning: Timestamp ordering violation at index %d. Expected > %v, got %v\n", idx, lastTimestamp, msg.Timestamp)
		}
		lastTimestamp = msg.Timestamp
		isFirst = false

		// Message type filter directive
		if len(cfg.MessageTypes) > 0 {
			matched := false
			for _, allowed := range cfg.MessageTypes {
				if strings.EqualFold(msg.Type, allowed) {
					matched = true
					break
				}
			}
			if !matched {
				continue
			}
		}

		// Media URL expiry verification pipeline
		if msg.Media != nil && msg.Media.URL != "" {
			if !verifyMediaURL(ctx, client, msg.Media.URL) {
				fmt.Printf("Warning: Media URL expired or unreachable: %s\n", msg.Media.URL)
				// Continue processing but flag in audit if needed
			}
		}

		validMessages = append(validMessages, msg)
	}

	// Automatic cache population trigger
	for _, msg := range validMessages {
		cfg.Cache[msg.ID] = msg
	}

	latency := time.Since(start).Milliseconds()
	auditLogger(AuditLog{
		Event:        "page_processed",
		PageToken:    pageToken,
		MessageCount: len(validMessages),
		LatencyMs:    latency,
		Timestamp:    time.Now(),
	})

	// Webhook synchronization for external archiving
	if cfg.WebhookURL != "" && len(validMessages) > 0 {
		syncToWebhook(ctx, client, cfg.WebhookURL, validMessages, pageToken)
	}

	return nil
}

func verifyMediaURL(ctx context.Context, client *http.Client, mediaURL string) bool {
	// Simulate expiry check by validating URL structure and performing a lightweight HEAD request
	if !strings.HasPrefix(mediaURL, "http") {
		return false
	}

	req, err := http.NewRequestWithContext(ctx, http.MethodHead, mediaURL, nil)
	if err != nil {
		return false
	}
	req.Header.Set("User-Agent", "GenesysHistoryRetriever/1.0")

	resp, err := client.Do(req)
	if err != nil {
		return false
	}
	defer resp.Body.Close()
	return resp.StatusCode >= 200 && resp.StatusCode < 400
}

func syncToWebhook(ctx context.Context, client *http.Client, webhookURL string, messages []Message, pageToken string) {
	payload, err := json.Marshal(map[string]interface{}{
		"event":        "history_batch_sync",
		"pageToken":    pageToken,
		"messageCount": len(messages),
		"messages":     messages,
		"timestamp":    time.Now().UTC().Format(time.RFC3339),
	})
	if err != nil {
		fmt.Printf("Webhook payload marshal failed: %v\n", err)
		return
	}

	req, err := http.NewRequestWithContext(ctx, http.MethodPost, webhookURL, bytes.NewReader(payload))
	if err != nil {
		fmt.Printf("Webhook request creation failed: %v\n", err)
		return
	}
	req.Header.Set("Content-Type", "application/json")

	resp, err := client.Do(req)
	if err != nil {
		fmt.Printf("Webhook sync failed: %v\n", err)
		return
	}
	defer resp.Body.Close()

	if resp.StatusCode >= 200 && resp.StatusCode < 300 {
		fmt.Printf("Webhook sync successful for token: %s\n", pageToken)
	} else {
		fmt.Printf("Webhook sync failed with status %d\n", resp.StatusCode)
	}
}

import "bytes" // Added to satisfy syncToWebhook

Step 4: Orchestrating the History Retriever

The main retriever loops through pagination tokens, enforces the maxDepth constraint, tracks retrieval rates, and exposes a clean interface for automated messaging management.

package main

import (
	"context"
	"fmt"
	"time"
)

type HistoryRetriever struct {
	client *http.Client
	config *RetrieverConfig
}

func NewHistoryRetriever(cfg *RetrieverConfig) *HistoryRetriever {
	return &HistoryRetriever{
		client: BuildGuestClient(),
		config: cfg,
	}
}

func (r *HistoryRetriever) Retrieve(ctx context.Context) error {
	if err := r.config.Validate(); err != nil {
		return fmt.Errorf("configuration validation failed: %w", err)
	}

	auditLog := func(log AuditLog) {
		logJSON, _ := json.Marshal(log)
		fmt.Printf("[AUDIT] %s\n", string(logJSON))
	}

	pageToken := ""
	pageCount := 0
	totalMessages := 0
	startTime := time.Now()

	for pageCount < r.config.MaxDepth {
		select {
		case <-ctx.Done():
			return ctx.Err()
		default:
		}

		page, err := fetchPage(ctx, r.client, r.config, pageToken)
		if err != nil {
			auditLog(AuditLog{Event: "fetch_error", Error: err.Error(), Timestamp: time.Now()})
			return err
		}

		if err := processPage(ctx, r.client, r.config, page, pageToken, auditLog); err != nil {
			auditLog(AuditLog{Event: "process_error", Error: err.Error(), Timestamp: time.Now()})
			return err
		}

		totalMessages += len(page.Entities)
		pageToken = page.Meta.NextPageToken
		pageCount++

		if pageToken == "" {
			fmt.Println("Pagination complete. No further pages available.")
			break
		}

		// Rate tracking
		elapsed := time.Since(startTime).Seconds()
		rate := float64(totalMessages) / elapsed
		fmt.Printf("Page %d fetched. Total messages: %d. Retrieval rate: %.2f msg/sec\n", pageCount, totalMessages, rate)
	}

	if pageCount >= r.config.MaxDepth {
		fmt.Println("Maximum history depth limit reached. Retrieval halted to prevent bandwidth exhaustion.")
	}

	auditLog(AuditLog{
		Event:        "retrieval_complete",
		MessageCount: totalMessages,
		LatencyMs:    time.Since(startTime).Milliseconds(),
		Timestamp:    time.Now(),
	})

	return nil
}

Complete Working Example

The following script combines all components into a runnable module. Replace the placeholder configuration values with your Genesys Cloud environment identifiers.

package main

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

// [Structs and validation from Step 1]
type RetrieverConfig struct {
	OrganizationID string
	DomainID       string
	ConversationID string
	BaseURL        string
	PageSize       int
	MaxDepth       int
	MessageTypes   []string
	WebhookURL     string
	Cache          map[string]Message
}

type Message struct {
	ID        string    `json:"id"`
	Type      string    `json:"type"`
	Text      string    `json:"text,omitempty"`
	Timestamp time.Time `json:"timestamp"`
	Media     *Media    `json:"media,omitempty"`
}

type Media struct {
	URL  string `json:"url"`
	Name string `json:"name"`
}

type PaginationMeta struct {
	NextPageToken       string `json:"nextPageToken"`
	PreviousPageToken   string `json:"previousPageToken"`
	PageSize            int    `json:"pageSize"`
	Total               int    `json:"total"`
}

func (c *RetrieverConfig) Validate() error {
	if c.OrganizationID == "" || c.DomainID == "" || c.ConversationID == "" {
		return fmt.Errorf("organizationId, domainId, and conversationId are required")
	}
	if c.PageSize <= 0 || c.PageSize > 50 {
		return fmt.Errorf("pageSize must be between 1 and 50 (gateway constraint)")
	}
	if c.MaxDepth <= 0 {
		return fmt.Errorf("maxDepth must be greater than 0 to prevent bandwidth exhaustion")
	}
	return nil
}

// [HTTP Client Builder]
func BuildGuestClient() *http.Client {
	return &http.Client{
		Timeout: 15 * time.Second,
		Transport: &http.Transport{
			TLSClientConfig: &tls.Config{InsecureSkipVerify: false},
			MaxIdleConns:        10,
			MaxIdleConnsPerHost: 5,
			IdleConnTimeout:     30 * time.Second,
		},
	}
}

// [Page Response & Fetch Logic from Step 2]
type PageResponse struct {
	Entities []Message      `json:"entities"`
	Meta     PaginationMeta `json:"meta"`
}

func fetchPage(ctx context.Context, client *http.Client, cfg *RetrieverConfig, pageToken string) (*PageResponse, error) {
	endpoint := fmt.Sprintf("%s/api/v2/public/messaging/%s/%s/%s/messages",
		cfg.BaseURL, cfg.OrganizationID, cfg.DomainID, cfg.ConversationID)

	params := url.Values{}
	params.Set("pageSize", fmt.Sprintf("%d", cfg.PageSize))
	if pageToken != "" {
		params.Set("nextPageToken", pageToken)
	}
	endpoint = endpoint + "?" + params.Encode()

	var lastErr error
	for attempt := 0; attempt < 5; attempt++ {
		req, err := http.NewRequestWithContext(ctx, http.MethodGet, endpoint, nil)
		if err != nil {
			return nil, fmt.Errorf("failed to create request: %w", err)
		}
		req.Header.Set("Accept", "application/json")

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

		if resp.StatusCode == http.StatusTooManyRequests {
			waitTime := time.Duration(1<<uint(attempt)) * time.Second
			fmt.Printf("Rate limited (429). Retrying in %v...\n", waitTime)
			time.Sleep(waitTime)
			lastErr = fmt.Errorf("429 Too Many Requests")
			continue
		}

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

		var page PageResponse
		if err := json.NewDecoder(resp.Body).Decode(&page); err != nil {
			return nil, fmt.Errorf("format verification failed: invalid JSON schema: %w", err)
		}
		return &page, nil
	}

	return nil, fmt.Errorf("max retries exceeded: %w", lastErr)
}

// [Processing, Validation, Cache, Webhook from Step 3]
type AuditLog struct {
	Event        string `json:"event"`
	Timestamp    time.Time `json:"timestamp"`
	PageToken    string `json:"pageToken,omitempty"`
	MessageCount int    `json:"messageCount"`
	LatencyMs    int64  `json:"latencyMs"`
	Error        string `json:"error,omitempty"`
}

func processPage(ctx context.Context, client *http.Client, cfg *RetrieverConfig, page *PageResponse, pageToken string, auditLogger func(AuditLog)) error {
	start := time.Now()
	auditLogger(AuditLog{Event: "page_fetch_start", PageToken: pageToken, Timestamp: time.Now()})

	var validMessages []Message
	var lastTimestamp time.Time
	isFirst := true

	for idx, msg := range page.Entities {
		if !isFirst && !msg.Timestamp.After(lastTimestamp) {
			fmt.Printf("Warning: Timestamp ordering violation at index %d. Expected > %v, got %v\n", idx, lastTimestamp, msg.Timestamp)
		}
		lastTimestamp = msg.Timestamp
		isFirst = false

		if len(cfg.MessageTypes) > 0 {
			matched := false
			for _, allowed := range cfg.MessageTypes {
				if strings.EqualFold(msg.Type, allowed) {
					matched = true
					break
				}
			}
			if !matched {
				continue
			}
		}

		if msg.Media != nil && msg.Media.URL != "" {
			if !verifyMediaURL(ctx, client, msg.Media.URL) {
				fmt.Printf("Warning: Media URL expired or unreachable: %s\n", msg.Media.URL)
			}
		}

		validMessages = append(validMessages, msg)
	}

	for _, msg := range validMessages {
		cfg.Cache[msg.ID] = msg
	}

	latency := time.Since(start).Milliseconds()
	auditLogger(AuditLog{Event: "page_processed", PageToken: pageToken, MessageCount: len(validMessages), LatencyMs: latency, Timestamp: time.Now()})

	if cfg.WebhookURL != "" && len(validMessages) > 0 {
		syncToWebhook(ctx, client, cfg.WebhookURL, validMessages, pageToken)
	}

	return nil
}

func verifyMediaURL(ctx context.Context, client *http.Client, mediaURL string) bool {
	if !strings.HasPrefix(mediaURL, "http") {
		return false
	}
	req, err := http.NewRequestWithContext(ctx, http.MethodHead, mediaURL, nil)
	if err != nil {
		return false
	}
	req.Header.Set("User-Agent", "GenesysHistoryRetriever/1.0")
	resp, err := client.Do(req)
	if err != nil {
		return false
	}
	defer resp.Body.Close()
	return resp.StatusCode >= 200 && resp.StatusCode < 400
}

func syncToWebhook(ctx context.Context, client *http.Client, webhookURL string, messages []Message, pageToken string) {
	payload, err := json.Marshal(map[string]interface{}{
		"event":        "history_batch_sync",
		"pageToken":    pageToken,
		"messageCount": len(messages),
		"messages":     messages,
		"timestamp":    time.Now().UTC().Format(time.RFC3339),
	})
	if err != nil {
		fmt.Printf("Webhook payload marshal failed: %v\n", err)
		return
	}
	req, err := http.NewRequestWithContext(ctx, http.MethodPost, webhookURL, bytes.NewReader(payload))
	if err != nil {
		fmt.Printf("Webhook request creation failed: %v\n", err)
		return
	}
	req.Header.Set("Content-Type", "application/json")
	resp, err := client.Do(req)
	if err != nil {
		fmt.Printf("Webhook sync failed: %v\n", err)
		return
	}
	defer resp.Body.Close()
	if resp.StatusCode >= 200 && resp.StatusCode < 300 {
		fmt.Printf("Webhook sync successful for token: %s\n", pageToken)
	} else {
		fmt.Printf("Webhook sync failed with status %d\n", resp.StatusCode)
	}
}

// [Orchestrator from Step 4]
type HistoryRetriever struct {
	client *http.Client
	config *RetrieverConfig
}

func NewHistoryRetriever(cfg *RetrieverConfig) *HistoryRetriever {
	return &HistoryRetriever{client: BuildGuestClient(), config: cfg}
}

func (r *HistoryRetriever) Retrieve(ctx context.Context) error {
	if err := r.config.Validate(); err != nil {
		return fmt.Errorf("configuration validation failed: %w", err)
	}

	auditLog := func(log AuditLog) {
		logJSON, _ := json.Marshal(log)
		fmt.Printf("[AUDIT] %s\n", string(logJSON))
	}

	pageToken := ""
	pageCount := 0
	totalMessages := 0
	startTime := time.Now()

	for pageCount < r.config.MaxDepth {
		select {
		case <-ctx.Done():
			return ctx.Err()
		default:
		}

		page, err := fetchPage(ctx, r.client, r.config, pageToken)
		if err != nil {
			auditLog(AuditLog{Event: "fetch_error", Error: err.Error(), Timestamp: time.Now()})
			return err
		}

		if err := processPage(ctx, r.client, r.config, page, pageToken, auditLog); err != nil {
			auditLog(AuditLog{Event: "process_error", Error: err.Error(), Timestamp: time.Now()})
			return err
		}

		totalMessages += len(page.Entities)
		pageToken = page.Meta.NextPageToken
		pageCount++

		if pageToken == "" {
			fmt.Println("Pagination complete. No further pages available.")
			break
		}

		elapsed := time.Since(startTime).Seconds()
		rate := float64(totalMessages) / elapsed
		fmt.Printf("Page %d fetched. Total messages: %d. Retrieval rate: %.2f msg/sec\n", pageCount, totalMessages, rate)
	}

	if pageCount >= r.config.MaxDepth {
		fmt.Println("Maximum history depth limit reached. Retrieval halted to prevent bandwidth exhaustion.")
	}

	auditLog(AuditLog{Event: "retrieval_complete", MessageCount: totalMessages, LatencyMs: time.Since(startTime).Milliseconds(), Timestamp: time.Now()})
	return nil
}

func main() {
	cfg := &RetrieverConfig{
		OrganizationID: "your-org-id",
		DomainID:       "your-domain-id",
		ConversationID: "your-conversation-id",
		BaseURL:        "https://api.mypurecloud.com",
		PageSize:       20,
		MaxDepth:       10,
		MessageTypes:   []string{"text", "image"},
		WebhookURL:     "https://your-archiving-system.com/api/sync",
		Cache:          make(map[string]Message),
	}

	retriever := NewHistoryRetriever(cfg)
	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Minute)
	defer cancel()

	if err := retriever.Retrieve(ctx); err != nil {
		fmt.Printf("Retrieval failed: %v\n", err)
	} else {
		fmt.Printf("Retrieval complete. Cached messages: %d\n", len(cfg.Cache))
	}
}

Common Errors & Debugging

Error: 400 Bad Request

• What causes it: Invalid organizationId, domainId, or conversationId. The pageSize parameter exceeds the gateway maximum of 50.
• How to fix it: Verify the routing identifiers match an active Web Messaging session. Ensure pageSize is between 1 and 50. The Validate() method catches configuration errors before network calls.
• Code showing the fix: The Validate() function enforces c.PageSize > 0 && c.PageSize <= 50.

Error: 404 Not Found

• What causes it: The conversation ID does not exist, the session has expired beyond the retention window, or the domain/org IDs are mismatched.
• How to fix it: Confirm the conversation is within the Genesys Cloud message retention period. Cross-reference IDs with the Genesys Cloud Admin console or internal API.
• Code showing the fix: The fetchPage function returns a structured error with the response body, allowing you to parse the exact Genesys error message.

Error: 429 Too Many Requests

• What causes it: The messaging gateway rate limit has been exceeded. This occurs during high-volume history pulls or concurrent retrieval instances.
• How to fix it: The implementation includes exponential backoff retry logic. If persistent, reduce PageSize or increase the delay between batches.
• Code showing the fix: The retry loop in fetchPage sleeps for 1<<uint(attempt) seconds on 429 status codes.

Error: Timestamp Ordering Violation

• What causes it: Network reordering, client-side clock skew, or partial message delivery during high-concurrency sessions.
• How to fix it: The pipeline logs a warning but continues processing. For strict archival compliance, sort the final cache slice by Timestamp before export.
• Code showing the fix: if !isFirst && !msg.Timestamp.After(lastTimestamp) triggers the warning pipeline.

Official References

• Genesys Cloud Public Messaging API Documentation
• Web Messaging Guest API Endpoint Reference
• Go net/http Package Documentation
• Go context Package Documentation