Customer Support
English
YCloud Developer Kit: Build and Test WhatsApp API Integrations with Codex
A messaging API accepts an order-confirmation request. But has the customer received the message?
Not necessarily.
A WhatsApp integration must answer several questions before it can work reliably:
- How will the application authenticate the API request?
- Is the correct message template available?
- How will delivery or failure updates be recorded?
- What happens if the same Webhook event arrives twice?
- What should the application do when a request times out and the result is uncertain?
These issues affect both the customer experience and the accuracy of internal business records. Developers therefore need to plan what happens before, during and after each message request.
This is where YCloud Developer Kit can help.
YCloud Developer Kit provides YCloud-specific skills in Codex for planning integrations, implementing local code changes and testing workflows with simulated data. Developers start by describing their requirements in natural language.
Based on those requirements, the Kit can help identify the required YCloud capabilities, structure the implementation and define relevant test scenarios.
In this article, we will use a WhatsApp order-confirmation workflow to explain how to:
- Install and verify YCloud Developer Kit
- Create an integration plan in Codex
- Apply the plan to a local project
- Test normal and failure scenarios with simulated data
- Identify what still requires verification with YCloud
- Prepare the integration for technical review and deployment
The Kit supports the development process inside Codex.
YCloud account configuration, production deployment and real-environment testing remain separate steps.
Before starting the workflow, let us first look at what YCloud Developer Kit is, what it can assist with and where its scope ends.
TL;DR
- Install YCloud Developer Kit in Codex and run the smoke test to confirm that its skills are available. This does not connect Codex to a YCloud account.
- Describe one business workflow, such as an order confirmation, and use "$ycloud-integration-architect" to identify the required messages, templates, Webhooks and authentication.
- Define the project, implementation scope and permitted actions before allowing local code changes.
- Apply the plan to API requests, business records and asynchronous event handling.
- Test successful and failure scenarios with simulated data. Treat timeouts as uncertain outcomes and do not confuse local results with real message delivery.
- Before release, configure the YCloud account, phone number, templates, server-side credentials and public Webhook. Then complete human review, real-environment testing, deployment and monitoring.
What is the YCloud Developer Kit?
YCloud Developer Kit is a Codex plugin containing YCloud-specific skills for integration development.
This article covers version 0.7.9.
It adds YCloud-specific guidance to Codex for selecting API capabilities, designing business logic and implementing workflows in a local project.
Developers can use it to turn business requirements into:
- Integration workflows and technical requirements
- Implementation plans
- Local code changes
- Test scenarios and recorded results when tests are executed
- Integration and deployment checklists
The Kit can support both new integrations and reviews of existing implementations.
Scope and Account Access
YCloud Developer Kit supports the development process inside Codex. Messaging operations and campaign management use separate tools.
The Kit can assist with:
- Integration planning
- Authorized local implementation
- Testing defined scenarios with simulated data
Installing the Kit does not connect Codex to a YCloud account, configure account resources or deploy an application.
The Kit can help developers write application code that calls YCloud APIs. However, the workflow covered in this article does not execute real API requests.
Live testing requires separate authorization, account access, server-side credentials and environment configuration.
Account-level feature availability must also be confirmed before deployment. Local test results apply only to the scenarios tested and do not replace verification against YCloud.
With the Kit’s purpose and boundaries established, the next section explains what a reliable WhatsApp integration must handle.
What a WhatsApp Integration Needs to Handle
Sending a message is only one part of a WhatsApp integration. The application must also track what happens before the request, after it is accepted and when later updates arrive.
Sending and Delivery Are Separate Stages
An accepted API request confirms that the message was accepted for processing. It does not confirm delivery.
The application should therefore:
- Record the original request
- Process later message-status events
- Store request submission separately from subsequent status updates
Always check the current YCloud documentation before implementing specific status values.
Webhooks Introduce Asynchronous Processing
Message-status events may arrive later, more than once or in a different order than expected.
Webhook handlers should:
- Validate incoming requests before processing them
- Handle duplicate, delayed and out-of-order events
- Prevent repeated business updates
- Connect each event to the original message and business transaction
For example, an order record should remain connected to its message request and all subsequent status updates.
Templates and Account Configuration Have External Dependencies
Template-based workflows require the correct template to be approved and available. The YCloud account and WhatsApp phone number must also be configured correctly.
Some capabilities may not be enabled for every account. These dependencies should be confirmed before integration testing or deployment.
The Integration Also Needs Reliable Operations
A production workflow should include:
- Secure server-side credential management
- Timeout handling without automatic duplicate sends
- Idempotency to prevent repeated business actions
- Logging, monitoring and alerts
- Recovery rules for failed or uncertain requests
- Separate test and production environments
- Failure investigation and rollback preparation
YCloud Developer Kit helps developers identify and structure these requirements during planning, implementation and testing.
The next section maps these requirements to the YCloud capabilities covered by the Kit.
Which YCloud Capabilities Does the Kit Cover?
YCloud Developer Kit version 0.7.9 covers 88 API operations and two cross-cutting capabilities.
The table below groups them by integration area.
These capabilities can be combined into workflows such as order notifications, shipping updates, contact synchronization and inbound-message routing.
Integration Area | How the Developer Kit Can Assist |
WhatsApp messages | Plan and implement direct or queued message submission, message retrieval and status handling |
Media | Implement media uploads and pass uploaded media references into message workflows |
Templates | Plan template creation, retrieval, updates, deletion and analytics |
Accounts and phone numbers | Identify prerequisites and implement supported account, registration, profile and phone-number settings operations |
Webhooks | Design endpoint management, event reception, source validation and duplicate-event handling |
Inbound messages | Route verified incoming-message events to application logic and implement supported acknowledgements |
Contacts | Design contact, attribute and note-management workflows |
Unsubscribers | Add unsubscribe checks and manage opt-out records |
Groups | Plan supported WhatsApp Groups, participant, settings and invite-link operations |
WhatsApp Flows | Design and implement supported Flow lifecycle operations |
WhatsApp Calling | Plan call handling and supported call-session operations |
Authentication | Structure secure server-side API authentication |
Balance | Retrieve and use account-balance information where required |
Custom events | Define and send business events associated with contacts, separately from incoming Webhook events |
Here, supported means the Kit can assist with integration design, local implementation and evaluation. It does not mean that every capability is enabled for a customer’s account or validated in production.
The version covered in this article focuses on WhatsApp integrations and related YCloud APIs.
SMS, Verify, YCloud Voice and Email are outside its scope.
YCloud Voice is a separate product area and should not be confused with WhatsApp Calling.
Now that the available capabilities are clear, the next section explains how developers can use them in a structured integration workflow.
How the YCloud Developer Kit Workflow Works
The Kit follows a five-stage development path:
Describe the workflow → Review the plan → Implement in your project → Test locally → Verify with YCloud and deploy
1. Define the Business Goal
Start with the required business outcome instead of selecting APIs first.
Provide:
- The customer experience to be created
- The existing system or application
- The event that starts the workflow
- The expected customer-facing outcome
- The information the internal system must record
- What is included and excluded from the current implementation
Common examples include order confirmations, shipping notifications, customer-support messaging, contact synchronization and unsubscribe verification.
2. Confirm the Integration Design
The Kit can map the business goal to:
- Required YCloud capabilities
- Account and phone-number prerequisites
- Template and sending requirements
- Business-record mapping
- Webhook and status-processing requirements
- Failure and duplicate-event handling
- Items that still require confirmation
Reviewing these points before implementation helps prevent missing dependencies or unnecessary development work.
3. Implement in Your Project
Once the plan is approved, specify exactly what Codex may change:
- The local project
- The modules included in the task
- Whether tests should be added
- Whether an isolated example or applied implementation is required
- Whether external API calls are prohibited
A clear implementation request can authorize the defined local work. It does not authorize changes to unrelated files or external systems.
4. Run Simulated Tests
Test both normal and failure scenarios, including:
- Successful request submission
- API rejection or sending failure
- Request timeout
- Duplicate message-status event
- Invalid Webhook
- Missing or incorrect configuration
Important: Treat a timed-out send request as an uncertain outcome. The request may have been accepted, so do not resend it only because the client timed out. Use available identifiers, status events and documented recovery behavior to decide the next action.
5. Verify With YCloud and Deploy
Before release, the technical team must configure and verify:
- YCloud account and WhatsApp phone number
- Approved message templates
- Server-side API keys
- Public Webhook endpoint
- Production environment variables
- Real API requests and status callbacks
- Monitoring and alerts
- Deployment and rollback procedures
Local development prepares the integration, while this final stage verifies it in the authorized YCloud environment.
Before starting this workflow, the next section lists the required environment and planning information.
Before You Start
Prepare the development environment and basic workflow information before using the Kit.
Environment Requirements
You need:
- A Codex environment supported by the documented release
- YCloud Developer Kit installed
- Access to the local application project when implementation is required
- A suitable development and testing environment
Check the installation requirements for the release being used before proceeding.
Information That Helps With Planning
Start with the use case, technology stack and desired workflow. Any missing requirements can be identified while reviewing the plan.
Provide:
- Existing system and technology stack
- Trigger event
- Expected message or customer experience
- Internal records that must be created or updated
- Current implementation status
- Scope of work
- Acceptance criteria
Information Not Required During Planning
Do not provide:
- Real API keys
- Real customer phone numbers
- Private customer conversations
- Production credentials
Security note: Use placeholders or synthetic data in plans, code examples and simulated tests. Store real credentials in the server-side environment using your team’s secret-management practices.
Once these requirements are ready, the next step is to install the YCloud Developer Kit and confirm that Codex can access it.
How to Install and Verify YCloud Developer Kit
YCloud Developer Kit 0.7.9 can be installed through the ChatGPT plugin page or directly from its repository. Use the method supported by your Codex environment; you do not need both.
Install the Developer Kit
Option 1: Install from ChatGPT
- Open the YCloud Developer Kit plugin page.
- Select Install or Try now.
- Confirm that the plugin is enabled in the Codex environment where you will use it.
- Start a new Codex task before running the verification prompt.
Option 2: Install from the Repository
From the target project directory, run:
</> Bash
npx skills add YCloud-Developers/YCloud-Developer-Kit --skill '*' -a codex --copy -y
This command installs all 17 YCloud skills for Codex in the current project. Start a new Codex session after installation so the skills can be discovered.
Run the Smoke Test
In the new Codex task, enter:
</> Plain Text
Use $ycloud-developer-kit-smoke-test to check whether the plugin is ready.
Expected response:
</> Plain Text
YCloud Developer Kit is ready. No external API was called.
What This Confirms
- Codex can find and invoke the smoke-test skill.
- The Kit is available in the current Codex environment.
- The check completed without calling an external API.
What This Does Not Confirm
- Connection to a YCloud account
- Valid API credentials
- Account-level feature availability
- Successful WhatsApp message delivery
- Production readiness
Once the smoke test succeeds, the next step is to use the Kit for a defined WhatsApp integration workflow.
Step-by-Step Example: Build a WhatsApp Order-Confirmation Integration
This example uses one workflow throughout the remaining steps.
Business Requirement
A fictional customer places order DEMO-1001 through an application built with Node.js, Express and SQLite.
The integration must:
- Trigger a WhatsApp order confirmation when the order is created
- Associate the message request with the order
- Record later delivery or failure events
- Keep the order valid even if the notification fails
Marketing broadcasts and customer replies are outside the current scope.
Step 1: Request an Integration Plan
Start by asking the integration architect to convert the business requirement into a technical plan.
Use $ycloud-integration-architect to plan a WhatsApp
order-confirmation integration.
Our backend uses Node.js, Express and SQLite.
After a customer places an order, send a WhatsApp confirmation.
The backend must associate the message with the order and record
subsequent delivery or failure events.
Include order-confirmation messages and message-status Webhooks only.
Do not include marketing broadcasts or inbound-message handling.
Provide the business flow, prerequisites, development steps, risks
and acceptance criteria.
Do not modify files or call real APIs.The plan should cover:
- Order-creation trigger
- Account and phone-number requirements
- Approved template requirement
- Message-submission flow
- Connection between the order, application correlation value, YCloud message ID and Webhook event
- Message-status Webhook flow
- Failure and duplicate-event handling
- Unresolved requirements
Step 2: Confirm the Scope
Before implementation, ask Codex to define the exact work boundary.
Limit this implementation to order-confirmation messages
and message-status processing.
List:
1. Required information
2. Modules that must be changed
3. Acceptance criteria
4. Items that still require confirmationScope confirmation helps the team:
- Prevent unrelated code changes
- Establish acceptance criteria
- Separate current work from future functionality
- Record unresolved dependencies
Step 3: Authorize Local Implementation
After approving the plan, explicitly authorize changes within the local project.
Implement the approved order-confirmation and message-status
flow in the current local project.
Identify the relevant order-notification and message-status
modules, implement the workflow there and add tests.
Use fictional orders and simulated data.
Do not read real credentials or call real APIs.
After implementation, list the changed files, configuration
requirements, test results and items that still require
real-environment verification.The expected deliverables are:
- Integration code
- Configuration placeholders
- Message-to-order correlation logic
- Webhook processing
- Normal and failure-path tests
- Local run instructions
- Known limitations
This authorization applies only to the defined local project and modules.
Step 4: Test Normal and Failure Scenarios
Important: This example uses simulated YCloud responses and synthetic Webhook events. It does not connect to a live YCloud account or send a real WhatsApp message.
Run both successful and failure-path tests:
Run local simulated tests for:
- Successful message submission
- API rejection and a later failed-message status as separate cases
- Request timeout
- Duplicate message-status event
- Invalid Webhook
Do not treat a timeout as confirmation that the message failed.
Separate executed tests, actual results and unverified items.Check that the implementation provides:
- Correct request formation
- Separate storage for submission and later message status
- Idempotent event processing
- No duplicate business updates
- Clear error reporting
- No automatic resend after an uncertain timeout
A timed-out request may have been accepted before the connection was lost. It should remain unresolved until available identifiers, later status events or documented recovery behavior provide more information.
Step 5: Prepare the Technical Handoff
Finally, ask Codex to separate completed local work from the remaining real-environment tasks.
List the remaining account configuration, integration tests
and deployment tasks for the technical team.
Separate completed local work from work that still requires
the authorized YCloud environment.
Include account, phone number, templates, API credentials,
Webhook configuration, testing, monitoring, exception handling
and rollback.
Do not perform real operations.The handoff should identify:
- Completed local implementation and tests
- YCloud account and phone-number requirements
- Approved template requirements
- Server-side credential configuration
- Public Webhook setup
- Real integration tests
- Monitoring and exception handling
- Deployment and rollback tasks
- Remaining risks and unresolved questions
The next section explains how to distinguish generated code, local test results, simulated validation and testing against YCloud.
Understanding the Different Validation Levels
Each development stage provides a different level of evidence. A completed stage should not be treated as proof of the next one.
Result | What it confirms | What it does not confirm |
Code generated | The requested implementation has been written | The code runs correctly |
Local tests passed | The defined local test cases produced the expected results | The real YCloud API behaves identically |
Local simulation completed | The selected scenarios ran through the fake YCloud adapter and signed synthetic Webhook events | Every YCloud capability or production scenario works |
Integration tested with YCloud | The specified workflow was tested in an authorized YCloud environment | Other workflows, scenarios or deployment environments were validated |
Warning: Validation applies only to the scenarios and environment tested. Verify the intended workflow with YCloud and follow your team’s release process before enabling customer-facing messages.
The next section explains which YCloud Developer Kit skill to use for each development task.
YCloud Developer Kit Skills and When to Use Them
YCloud Developer Kit routes each development task to a dedicated skill.
Development task | Recommended skill |
| Plan an end-to-end integration | $ycloud-integration-architect |
| Implement WhatsApp message submission and retrieval | $ycloud-whatsapp-messages |
| Implement template-management workflows | $ycloud-whatsapp-templates |
| Implement media uploads | $ycloud-whatsapp-media |
| Implement Webhook configuration and event handling | $ycloud-webhook-endpoints |
| Implement contact synchronization | $ycloud-contacts |
| Implement unsubscribe checks | $ycloud-unsubscribers |
| Design server-side authentication | $ycloud-api-authentication |
Developers do not need to memorize every skill.
- Use "$ycloud-integration-architect" when the requirement involves multiple YCloud capabilities or the correct starting point is unclear.
- Use a task-specific skill when the required capability and implementation scope are already defined.
Additional skills cover WhatsApp Business Accounts, phone numbers, Groups, Flows, custom events and WhatsApp Calling.
Choosing the correct skill defines the technical area. The next section explains how to provide the business context, scope and expected output through an effective prompt.
How to Write Effective Prompts for YCloud API Integration
A useful integration prompt should contain five parts:
Business goal + Current system + Scope + Authorized actions + Required output
1. Business Goal
Explain what should happen for the customer or internal team.
For example: send an order confirmation after checkout and record later message-status updates.
2. Current System
Provide enough project context for Codex to place the integration correctly:
- Existing or new project
- Technology stack
- Relevant services and databases
- Existing message or Webhook implementation
3. Scope
State what the current task includes and excludes.
For example: include order confirmations and status Webhooks, but exclude marketing broadcasts and customer replies.
4. Authorized Actions
Specify what Codex may do:
- Planning only
- Code review only
- Generate an isolated example
- Modify the defined local project
- Add or run tests
- Do not call external APIs
Clear authorization prevents assumptions about file changes or external operations.
5. Required Output
Request deliverables that can be reviewed:
- Architecture
- Prerequisites
- Changed files
- Test evidence
- Risks and unresolved questions
- Acceptance criteria
- Production-readiness checklist
Reusable Prompt
Use YCloud Developer Kit to help implement [business workflow]
in our [technology stack] project.
The workflow starts when [trigger] and should produce [outcome].
Include [scope] and exclude [out-of-scope items].
You may [permitted actions].
Use simulated data and do not call real APIs.
Provide the implementation plan, changed files, executed tests,
actual results and remaining integration requirements.
Ask about missing details that affect the design.A clear prompt defines both the expected integration and the limits of the task.
The next section covers the security and development practices that should apply while implementing it.
Security and Enterprise Development Practices
Generated integration code should follow the same security and review standards as manually written code.
Protect Credentials and Customer Data
- Do not paste API keys or Webhook secrets into prompts.
- Do not hardcode credentials in the repository.
- Use synthetic phone numbers and payloads in examples and local tests.
- Keep production credentials in the server-side environment.
- Use the team’s approved secret-management and access-control practices.
Credentials should not appear in client-side code, URLs, logs or generated examples.
Check Against the Official API Documentation
Before using generated examples in production, confirm the current:
- API endpoints and request methods
- Required and optional fields
- Authentication requirements
- Response and error formats
- Supported behavior
The local example in this article may use the label:
synthetic_unverifiedThis means the result was produced with synthetic data and some API fields or behavior still require confirmation. It is not a YCloud message status or evidence of a live API test.
Documentation review confirms the expected API contract. Testing against YCloud confirms how the defined workflow behaves in an authorized environment. These are separate checks.
Design Webhooks for Reliability
Webhook handlers should:
- Validate the source before business processing
- Reject invalid signatures or payloads
- Process duplicate events without repeating business actions
- Preserve unknown events for investigation
- Follow YCloud’s documented response requirements
- Connect each event to the correct message and business record
- Log useful identifiers without exposing credentials or customer data
Separate Environments
Keep development, testing and production configuration separate.
- Do not use production credentials for routine local tests.
- Use environment-specific configuration.
- Record which scenarios were simulated.
- Record which scenarios were verified against real services.
Maintain Human Review
Review generated code and test evidence before:
- Configuring production credentials
- Enabling customer-facing messages
- Deploying Webhook changes
- Changing retry or recovery behavior
- Enabling a new WhatsApp capability
These actions should follow the organization’s normal review, release and rollback process.
The next section summarizes the Kit’s limitations and the checks that still remain outside local development.
Limitations and Important Notes
Keep the following boundaries in mind when using YCloud Developer Kit.
Installation and Account Access
Installing the Kit only makes its skills available in Codex. It does not:
- Connect Codex to a YCloud account
- Validate API credentials
- Configure phone numbers or templates
- Enable account-level features
- Deploy the application
Templates, phone numbers and other external resources may require separate setup, approval or account permissions.
Simulation Coverage
Simulation coverage varies by capability. Check the version 0.7.9 release materials and the generated project’s test files before stating which scenarios are supported.
The order-confirmation example covers:
- Successful message submission
- API rejection and later failure events
- Request timeout
- Duplicate status events
- Invalid Webhooks
It does not verify:
- Live authentication
- Real account or template configuration
- Actual Webhook delivery
- Real WhatsApp message delivery
- Production-scale reliability
Starting the Local Simulation
Installing the plugin does not automatically start a simulation environment.
This example uses a fake adapter and synthetic Webhook fixtures inside the local project.
The simulation runs through the test command:
node --test --test-concurrency=1 test/*.test.jsNo separate simulator service is required for this recorded example. Other workflows may use different fixtures or optional mock tooling, so follow the instructions provided with that implementation.
Validation Boundaries
- A successful API request does not prove message delivery.
- Generated code must be reviewed and executed.
- Local validation does not equal production validation.
- Feature support in the Kit does not guarantee account-level availability.
- Test results apply only to the scenarios and environment tested.
Version and Deployment Boundaries
Version 0.7.9 excludes SMS, Verify, YCloud Voice and Email integrations. The release focuses on WhatsApp integrations and related YCloud APIs.
Production configuration, integration testing, deployment, monitoring and rollback remain the organization’s responsibility.
With these limitations established, the next section explains when teams should use YCloud Developer Kit.
When Should Teams Use YCloud Developer Kit?
YCloud Developer Kit is suitable when teams need to:
- Plan a new WhatsApp integration
- Add WhatsApp notifications to an existing product
- Implement message-status Webhooks
- Review a partially completed integration
- Identify missing failure and recovery scenarios
- Prepare an implementation brief for another engineering team
- Produce a production-readiness checklist
- Coordinate a workflow across multiple YCloud capabilities
Teams can stop after the architecture and planning stage.
When local implementation is required, they can continue by authorizing changes to a defined project and running simulated tests.
The level of work should match the project’s current stage, scope and approval process.
Up next, the final section summarizes how teams can begin with one controlled WhatsApp integration workflow.
Final Thoughts!
YCloud Developer Kit provides a structured path from a business requirement to an integration plan, local code and simulated tests. It helps developers account for templates, authentication, Webhooks, message statuses and failure handling during development.
The Kit complements, not replaces, engineering review, official YCloud API documentation, production configuration and real-environment validation.
Start with one clearly defined workflow, such as an order confirmation. Develop its plan, implement it within an approved local scope, test the required scenarios and document what still needs verification with YCloud.
Start With One WhatsApp Workflow
Then open a new Codex task and start with one defined workflow:
Use $ycloud-integration-architect to plan a WhatsApp
[workflow name] integration.
Specify the trigger, expected outcome and implementation scope. Complete account configuration and real-environment validation separately before release.
The next section answers common questions about account access, real messages, project changes and production readiness.
Frequently Asked Questions
Is YCloud Developer Kit the Same as the YCloud Dashboard?
No. YCloud Developer Kit is an integration-development assistant used within Codex. Messaging operations and campaign management use separate tools.
Does Installing the Kit Connect It to a YCloud Account?
No. YCloud account access, credentials and external resources must be configured separately.
Can It Send Real WhatsApp Messages?
Not by itself.
Version 0.7.9 can help developers write application code that sends messages through YCloud. However, the Kit does not read live credentials, call YCloud APIs or send real messages during its workflow. Real sending occurs separately through the configured application in an authorized environment.
Do Developers Need to Provide an API Key During Planning?
No. Planning, code examples and simulated tests can use placeholders and synthetic data.
Can It Modify an Existing Project?
Yes. The developer must explicitly authorize local file changes and define the project, modules and permitted scope.
Does a Passed Simulation Mean the Integration Is Production-Ready?
No. A simulation validates only the defined local scenarios. Production configuration and testing against YCloud are still required.
Can It Help Build Inbound-Message Handling?
Yes. It can help implement Webhook handlers that validate and route incoming-message events to the application’s business logic.
Does It Support Templates, Contacts and Unsubscribe Management?
Yes. Version 0.7.9 includes dedicated guidance for template, contact and unsubscriber workflows.
Does It Support SMS, Voice, Verify or Email?
No. SMS, Verify, YCloud Voice and Email integrations are outside the stated scope of version 0.7.9.
WhatsApp Calling is supported and is separate from YCloud Voice.
What Happens If the Official API Documentation Cannot Be Verified?
Mark the example as unverified and identify the endpoints, fields or behavior that still require confirmation.
If the Kit returns:
"synthetic_unverified"
It means the result was produced with synthetic data and the stated contract details were not fully verified. It is not a YCloud API status or evidence of real integration testing.
Related Articles
Make your business communications much easier！
Trusted by
