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Webhook Deduplication Checklist for Developers

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Table of contents
Webhook Deduplication Checklist for Developers

Webhook deduplication ensures systems process events once, avoiding issues like double payments or repeated notifications. Platforms often use "at-least-once" delivery, leading to duplicate webhooks due to retries, network instability, or high traffic. This guide offers practical steps to handle duplicates effectively, including using unique event IDs, idempotent logic, timestamp validation, and secure signature verification. Tools like Latenode simplify these processes with features like visual workflow builders, built-in databases, and execution history tracking, helping developers create reliable, scalable systems for managing webhook traffic.

Webhook Deduplication in the Hookdeck Event Gateway - Suppress Duplicates and Noisy Webhooks

Hookdeck

1. Use Event IDs to Identify Duplicates

Event IDs act as a key safeguard against processing duplicate webhooks, functioning as unique markers for each webhook event. When webhook providers send events, they usually include a unique identifier that remains unchanged across all delivery attempts for that specific event. This makes it one of the most dependable methods for identifying duplicates[3].

To avoid reprocessing, verify whether the event ID is already stored in your records before handling the webhook. If the ID is found, it indicates a duplicate and can be safely ignored. If not, proceed with processing the event and store its ID for future reference[3].

Store Event IDs for Comparison

Most webhook providers include event identifiers in standard headers or payload fields, such as X-Event-ID, event_id, or other custom headers[1]. To efficiently detect duplicates, use a reliable, indexed database to store these IDs. Best practices involve indexing the ID field to enable quick lookups and setting retention policies that balance storage costs with deduplication needs[3].

In 2022, Shopify advised developers to track event IDs and timestamps to prevent duplicate webhook processing. They also recommended implementing reconciliation jobs to retrieve missing data, ensuring consistency for merchants and developers[2].

Similarly, Fireblocks emphasizes tracking event IDs and ignoring those already processed as part of their webhook best practices[3].

To avoid issues like race conditions, especially in distributed or multi-threaded systems, use atomic database queries. When a webhook is received, query your database for the event ID. If it already exists, skip processing. Otherwise, store the ID and continue processing the event[3]. This approach ensures reliable deduplication and sets the foundation for seamless integration with tools like Latenode.

Using Latenode for ID Storage

Latenode

With these storage strategies in mind, Latenode simplifies the process by providing a built-in database for storing and querying event IDs directly within its automation workflows. This eliminates the need for external systems and allows developers to integrate deduplication logic effortlessly.

Latenode's native database integration minimizes setup time and operational complexity. It ensures that deduplication is tightly integrated with other automation steps, addressing challenges such as race conditions and lookup delays. Developers can design workflows that automatically check incoming webhook event IDs against stored records, process new events, and maintain audit trails - all within a single platform.

Using Latenode's visual workflow builder, you can create logic to extract event IDs from webhook headers, perform database lookups, and determine whether an event has already been processed. The platform's scalable storage and orchestration capabilities handle challenges like database growth, lookup speed, and concurrency issues when managing event IDs at scale[4].

This unified solution offers centralized and reliable storage for event IDs, ensuring strong consistency. Additionally, features like monitoring and execution history help maintain the integrity of deduplication across your webhook workflows.

2. Build Idempotent Processing Logic

Idempotency is a crucial concept in webhook processing, ensuring that handling the same event multiple times produces the same outcome as processing it just once. This approach acts as a safeguard against issues like double charges, duplicate database entries, or repeated notifications - problems that can arise when webhook providers retry failed deliveries or network glitches lead to duplicate events.

When paired with event ID tracking, idempotent logic strengthens your system’s ability to handle duplicates effectively. Below, we’ll explore actionable strategies for implementing this logic in your workflows.

Design Systems to Handle Repeated Requests

Creating idempotent systems starts with verifying the current state of resources before taking any action. This involves querying your database or external systems to confirm whether the resource the webhook affects has already been processed.

For example:

  • Payment webhooks: Before recording a transaction, confirm that it hasn’t already been logged to avoid duplicate payment entries.
  • User registration events: Check whether the user account already exists before attempting to create it.
  • Inventory updates: Compare current stock levels with the intended changes in the webhook to determine if adjustments are necessary.

Database transactions are essential to maintaining idempotency. Using atomic operations ensures that actions either complete fully or fail entirely, avoiding partial updates that could leave your system in an inconsistent state. These operations also help prevent race conditions in critical sections. Additionally, implement error-handling mechanisms to distinguish between temporary failures (which may require retries) and permanent ones (which should be logged for further investigation).

Streamline Idempotency with Latenode's Visual Workflow Builder

To simplify the implementation of idempotent logic, platforms like Latenode offer powerful tools tailored for webhook processing. Latenode’s visual workflow builder enables developers to design workflows that naturally handle repeated requests without unnecessary complexity.

The platform’s built-in database allows you to store and check processing states directly within the workflow. For instance, you can query the database to confirm whether an event has already been processed. Based on the result, the workflow can either proceed with new actions or safely exit if the event has already been handled.

With conditional logic nodes, you can create workflows that branch intelligently. These nodes make it easy to incorporate checks for event processing status, ensuring that only new events trigger actions while duplicates are bypassed.

For more advanced needs, Latenode’s native JavaScript support offers flexibility to implement custom validation rules, state comparisons, and other nuanced idempotency logic. This ensures your workflows can address complex business requirements while maintaining the simplicity and clarity of the visual builder.

Additionally, the execution history feature provides transparency into how your workflows handle duplicate events. You can review which events were processed and which were skipped, helping you refine your idempotency rules and confirm they’re functioning as intended across various scenarios.

Latenode also supports atomic transactions, ensuring that idempotency checks and subsequent processing occur as a single, unified operation. This eliminates the risk of race conditions and preserves data integrity, particularly when managing high volumes of webhook traffic where timing and consistency are critical.

3. Check and Compare Event Timestamps

When webhook events arrive out of order or face delays, they can disrupt your workflow. Validating timestamps helps you process only the most current and relevant events, ensuring your system stays accurate and efficient.

Without timestamp checks, delayed events could trigger incorrect actions, leading to errors. By combining timestamp validation with unique identifiers and idempotency, you create a robust system that processes events reliably.

Methods for Timestamp Validation

Timestamp validation involves comparing an event's timestamp to a reference point. Here are some practical approaches:

  • Compare the event's timestamp to the server's current time and define a time window (or grace period) to filter out outdated events.
  • Maintain a record of the most recent timestamp for each unique resource in your database. Process new events only if their timestamp is newer than the stored value.
  • Apply custom business logic to handle events that fall within acceptable time ranges.

Use Cases in Latenode

Latenode's visual workflow builder and integrated database make it straightforward to implement timestamp checks without requiring heavy coding. Here's how you can use it:

  • Build workflows that compare incoming webhook timestamps with the server's current time or previously stored values using simple conditional logic.
  • Leverage custom JavaScript to handle more complex tasks, such as timezone conversions or precise time difference calculations, tailoring the validation process to your specific business needs.
  • Monitor your workflows through execution history, allowing you to see which events were processed or rejected based on timestamp rules. This insight helps you fine-tune your workflows for better reliability.
  • Utilize Latenode's parallel execution capabilities to manage high volumes of webhook events, ensuring timestamp checks and database updates happen smoothly and consistently.

4. Manage Idempotency Keys

Idempotency keys serve as a safeguard to ensure that critical operations, like processing payments or fulfilling orders, are executed only once. These unique identifiers help prevent costly mistakes and maintain the integrity of your data.

By setting up systems for storing and validating these keys, you can effectively shield your processes from duplicate execution scenarios.

Best Practices for Key Storage and Management

Managing idempotency keys effectively involves three main steps: secure generation, persistent storage, and automated expiration.

  • Secure Generation: The keys must be unique and unpredictable. Using UUIDs is a common approach, but for workflows requiring extra security, cryptographically secure random strings or hashes of event-specific data are excellent alternatives.
  • Persistent Storage: To ensure keys are available even after system restarts, store them in durable storage. It's crucial to use atomic operations to check and store keys simultaneously, avoiding race conditions in environments with high concurrency.
  • Automated Expiration: Keys should have an expiration period to manage storage efficiently while preserving deduplication. The retention period should match your webhook provider's retry policy. For instance, if retries can occur for up to 72 hours, keys should be kept at least that long.

In 2023, Shopify highlighted the importance of idempotency keys for handling duplicate webhook events. They advised developers to store these keys in a database and implement logic to bypass events with previously processed keys[2].

These practices can be seamlessly integrated into Latenode's automation workflows, offering a streamlined approach to deduplication.

Simplifying Key Management with Latenode

Latenode provides a visual workflow builder that simplifies the process of managing idempotency keys. You can create logic to validate keys by checking for their existence before processing webhook events. If a duplicate request is detected, the platform can return the stored response and skip reprocessing.

Here’s how it works:

  • Extract the idempotency key from the webhook request.
  • Query Latenode’s database to check if the key already exists.
  • If the key is found, return the stored response and terminate further processing.
  • If the key is new, process the event, store both the key and the response, and proceed with normal execution.

For more advanced scenarios, Latenode supports custom JavaScript, allowing you to generate cryptographic hashes from event data or implement other complex key management techniques. The platform also ensures reliable key handling with atomic database operations, even under heavy webhook traffic.

Additionally, Latenode’s execution history gives you a clear view of which events were processed or skipped based on idempotency rules. This visibility helps you refine your deduplication strategy for smoother operations.

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5. Set Up Event Queues and Background Processing

Event queues act as a buffer for incoming webhooks, keeping them from directly overwhelming your processing logic. This approach is particularly useful during traffic surges or when retry storms occur, ensuring your system stays stable and processes events in an orderly manner. By working alongside earlier deduplication methods, queuing helps maintain reliability even under heavy loads.

Webhook providers often retry failed deliveries several times due to network issues. Without a queuing system in place, these retry bursts can quickly overload your servers, potentially leading to cascading failures.

Advantages of Event Queuing

Event queues offer three major benefits that are especially helpful for webhook deduplication: load distribution, failure isolation, and processing control.

  • Load Distribution: By queuing events for asynchronous processing, your system can handle traffic spikes more effectively. This prevents issues like memory exhaustion or database connection overloads during high-traffic periods.
  • Failure Isolation: Queues separate the receipt of webhooks from their processing. If a failure occurs - such as a database outage or an external API timeout - the events remain safely stored in the queue, ready for later processing. This prevents webhook providers from marking your endpoint as unreliable.
  • Processing Control: Queues allow for flexible retry policies and batch processing strategies. For example, you can prioritize specific event types, apply exponential backoff for retries, or pause processing during maintenance without losing data. Additionally, dead letter queues can isolate events that repeatedly fail, ensuring they don’t block the processing of valid events.

Latenode's Background Workflow Features

Latenode simplifies event queuing and background processing with its intuitive visual workflow builder. Using webhook triggers and an execution management system, Latenode automatically queues incoming requests and processes them asynchronously, ensuring smooth and efficient handling of events.

The platform provides an execution history feature, offering a clear view of queued events, including those pending, in progress, or completed. This transparency helps you identify bottlenecks and monitor performance without needing to set up extra logging tools. By integrating seamlessly with deduplication strategies, Latenode strengthens webhook reliability.

For managing high-volume workloads, Latenode supports parallel executions based on your subscription plan. For instance, the Team plan allows up to 20 workflows to run simultaneously, while Enterprise plans can handle 150 or more concurrent processes. This scalability ensures your system keeps up with increasing event volumes without missing a beat.

Latenode's built-in database plays a central role in both queuing and deduplication. You can design workflows that check for existing event IDs before processing, store idempotency keys, and maintain processing states across multiple executions. Thanks to atomic database operations, the platform ensures data consistency, even under heavy concurrent loads.

Additionally, the visual builder supports conditional logic, enabling you to fine-tune your queue management. You can create workflows that route different event types to specialized processing paths, apply custom retry logic using JavaScript, and integrate with external monitoring tools to track queue health and performance metrics. These features make Latenode a robust solution for handling even the most complex webhook scenarios.

6. Verify Webhook Signatures for Security

Ensuring the integrity of your webhook pipeline is critical, and signature verification plays a key role in this process. By validating webhook signatures, you add an essential layer of protection against tampering, replay attacks, and forged events. Without this safeguard, attackers could bypass your deduplication system, leading to corrupted data or triggering unauthorized actions in your application.

Many webhook providers include cryptographic signatures in their HTTP headers, often generated using HMAC (Hash-based Message Authentication Code) with SHA-256. These signatures confirm that the webhook originates from the intended provider and that the payload has remained intact during transmission.

Validate Event Authenticity

Signature validation involves comparing a computed hash of the payload against the signature provided by the webhook sender. This process relies on a shared secret key known only to you and the provider, ensuring that attackers cannot generate valid signatures. Importantly, this validation step must occur before any deduplication logic to prevent malicious actors from replaying legitimate event IDs with altered payloads.

The standard validation process includes the following steps:

  • Extract the signature from the webhook headers.
  • Use the secret key to compute the HMAC-SHA256 hash of the raw payload.
  • Perform a constant-time comparison between the computed hash and the provided signature to avoid timing attacks.

If the signatures do not match, the webhook should be rejected immediately without further processing. Additionally, many providers include a timestamp in their signature schemes, which you should validate to guard against replay attacks. Rejecting webhooks older than 5–10 minutes ensures that intercepted webhooks cannot be reused by attackers.

Secure Credential Management in Latenode

Once signature validation is in place, managing webhook credentials securely becomes equally important. Latenode offers a secure and efficient way to handle webhook secrets within your workflows. The platform's encrypted credential storage ensures that sensitive keys remain protected and are only accessible to authorized workflows, reducing the risk of accidental exposure in your code or configuration files.

With Latenode, you can store webhook secrets as encrypted credentials and reference them directly in JavaScript nodes. The platform manages encryption and decryption automatically, allowing your validation logic to focus solely on cryptographic operations without worrying about key management.

For advanced use cases, Latenode's JavaScript support lets you implement custom signature validation logic using Node.js crypto libraries. You can create reusable functions to handle various webhook providers' signature formats and integrate these functions seamlessly into your workflows. This flexibility simplifies the process of managing diverse webhook integrations.

Additionally, the visual workflow builder in Latenode enables you to design conditional logic that responds to signature validation results. For example, you can configure workflows to immediately discard invalid webhooks while processing valid ones through your deduplication and data pipelines. This ensures consistent and reliable signature validation across all your webhook endpoints.

For organizations with strict compliance requirements, Latenode's self-hosting option offers added control over credential storage and access. Deploying Latenode on your own infrastructure keeps webhook secrets within your environment while still leveraging the platform's automation capabilities.

Finally, Latenode's execution history feature enhances security monitoring by providing detailed logs of webhook validation attempts. You can track failed validations, detect potential attack patterns, and configure alerts for suspicious activity. This visibility not only strengthens your security posture but also aids in resolving legitimate webhook delivery issues effectively.

7. Plan for Failure Recovery and Data Sync

Even the most reliable webhook systems can encounter failures, making it crucial to have a solid recovery plan in place. Issues like network disruptions, service outages, or processing errors can lead to missed events, which in turn jeopardize data accuracy and consistency.

Webhook delivery is inherently uncertain. Platforms such as Shopify explicitly recommend against relying solely on webhook delivery. Instead, they advise developers to implement periodic reconciliation jobs to ensure data remains accurate[2]. This strategy treats webhooks as a performance booster rather than the definitive source of truth, with regular data synchronization acting as a safeguard. Let’s explore how to build effective recovery jobs to address these challenges.

Build Recovery Jobs

Recovery jobs play a key role in maintaining data accuracy by fetching the current state from source systems and comparing it with your local database. This process helps identify and resolve discrepancies, especially when deduplication isn’t enough to prevent missed or duplicate events.

The most efficient recovery jobs use incremental synchronization. By applying filters like updated_at, they retrieve only the records that have changed since the last successful sync. This method reduces API calls, minimizes processing time, and ensures recent updates are captured effectively.

For instance, if webhook events are missed, a recovery job could fetch all customer records updated in the past 24 hours from your CRM’s API. These records would then be compared with your local database to detect any changes - such as new, updated, or deleted customer data - that occurred during the outage. Any mismatches would prompt updates to restore consistency.

Timing is essential. As Hookdeck highlights, proactive reconciliation can prevent prolonged downtime.

Hookdeck, which handles over 100 billion webhooks annually, stresses the importance of building reconciliation tools proactively rather than reactively[4].

Recovery jobs should also include robust error handling and alert mechanisms. If API calls fail or produce unexpected results, the system should log the issues and notify your team immediately. Additionally, using dead-letter queues ensures failed recovery attempts are saved for further investigation instead of being lost.

Automate Recovery with Latenode

To simplify and enhance recovery efforts, automation platforms like Latenode can be a game-changer. Latenode’s visual workflow builder allows you to design and automate intricate recovery processes without needing extensive custom coding. You can set up workflows that periodically pull data from source systems, compare it to your local database, and automatically resolve any inconsistencies using its 300+ app integrations.

With Latenode's scheduling tools, you can run reconciliation jobs at intervals that suit your needs - hourly for critical data or daily for less sensitive updates. Conditional logic can be incorporated to determine whether synchronization is necessary, factoring in elements like the time of the last successful run or recent webhook failures.

For more complex recovery scenarios, Latenode’s JavaScript support enables custom logic for comparing and transforming data. For example, you can create workflows that handle differences in data formats between systems or apply specific business rules to resolve conflicting updates.

Another standout feature is Latenode’s built-in database, which allows you to store essential synchronization metadata directly within your workflows. This includes timestamps of the last sync, processed record checksums, or lists of identified discrepancies. By centralizing recovery logic, you eliminate the need for external storage solutions.

Latenode’s execution history offers transparency into your recovery processes. You can monitor completed jobs, identify recurring failure patterns, and track discrepancies over time. This data can help refine recovery schedules and address underlying issues in your webhook system.

For organizations with strict compliance requirements, Latenode’s self-hosting option provides added security. It ensures that sensitive data, such as API credentials and customer information, stays within your environment while still leveraging the platform’s automation capabilities for orchestrating complex recovery workflows.

8. Track Events with Logs and Audit Records

Detailed logging plays a vital role in debugging webhooks by helping identify duplicates, failures, and compliance-related data. This process works hand-in-hand with earlier measures like deduplication, idempotency, and security protocols to ensure smooth and reliable operations.

Without proper logs, diagnosing missed events - whether due to network issues, processing glitches, or duplicate filtering - can become a daunting task. A well-structured logging system creates an audit trail that simplifies troubleshooting and supports long-term analysis of webhook behavior and system performance.

Event Logging Best Practices

To effectively log webhook events, it's important to capture key details for every event from the moment it’s received to its final processing stage, including any deduplication decisions.

The most critical fields to log include the unique event ID, timestamp in UTC, source system, event type, processing status, and deduplication actions. For debugging purposes, also track the raw payload, HTTP headers, signature validation results, and processing duration.

Structured JSON logs are highly recommended, as they allow for consistent formatting and easy parsing. Key fields might include event_id, source_system, event_type, processed_at, duplicate_detected, and processing_time_ms. Use logging levels strategically:

  • INFO: For successful event processing.
  • WARN: For near-duplicate events.
  • ERROR: For processing failures.
  • DEBUG: For capturing detailed payload information during development; however, this level should be restricted in production environments.

Retention policies should strike a balance between storage costs and compliance needs. While critical audit data may need to be stored for several years, debug-level logs can often be deleted after 30 days. Tiered storage solutions can help - keeping recent logs readily accessible while archiving older ones in cost-effective storage options.

Sensitive data like payment details should never be logged directly. Instead, log hashed information or secure references to maintain privacy and security.

Using Latenode's Execution History

Latenode simplifies event tracking with its built-in execution history, making it easier to follow best practices for logging. Every workflow execution is automatically documented, capturing essential details like input data, processing results, and timing for each step.

The platform provides comprehensive execution metadata, including start and end timestamps, processing durations for individual workflow nodes, error messages, and data transformations. This is particularly useful for webhook deduplication workflows, as it shows when duplicate detection logic was triggered and the decisions made during processing.

Latenode also offers real-time monitoring, allowing you to watch webhook processing as it happens. This feature helps you identify bottlenecks, observe how events flow through deduplication logic, and detect patterns in duplicate events. Such insights can lead to workflow optimizations and early issue detection.

For historical analysis, Latenode’s searchable execution logs make it easy to identify trends. By filtering logs by date range, workflow type, or execution status, you can uncover patterns - such as specific event types being more prone to duplication during certain times - and adjust your deduplication logic proactively.

When webhook processing fails, detailed execution traces provide clarity. You can pinpoint the exact moment of failure, review input data, and understand the sequence of operations, making troubleshooting faster and more effective.

For compliance purposes, Latenode’s execution history acts as an immutable audit trail, automatically maintaining records of all workflow executions and data processing decisions. If you prefer self-hosting, sensitive audit data can remain within your infrastructure while still benefiting from Latenode’s robust logging capabilities.

Additionally, Latenode supports custom logging through its JavaScript capabilities and integrations with over 300 apps. This allows you to extend its built-in logging features with external tools for advanced analysis and alerting, creating a hybrid approach that combines automatic execution tracking with specialized solutions.

Conclusion: Building Deduplication Systems with Latenode

Ensuring webhook deduplication requires a multi-layered strategy that combines unique event IDs, idempotent processing, timestamp validation, and effective key management. These techniques, discussed earlier, are crucial for creating systems that process each event only once. By implementing measures such as storing event IDs, managing idempotency keys, robust logging, and failure recovery, developers can build reliable webhook systems capable of handling the demands of modern applications.

Latenode simplifies this process by offering a comprehensive platform that addresses every aspect of webhook deduplication. With its visual workflow builder and coding flexibility, Latenode integrates storage, lookup functions, and execution history to provide automatic audit trails for compliance and debugging. This streamlined approach allows developers to focus on building efficient systems without getting bogged down by complex infrastructure.

Using Latenode’s visual workflow builder, developers can implement advanced deduplication logic while retaining the ability to customize with code. Workflows can validate event IDs, check timestamps to prevent replay attacks, and manage idempotency keys, significantly reducing development time and ensuring reliability in production environments.

For high-volume webhook processing, Latenode’s background workflow capabilities provide scalable solutions. The platform supports integration with external queuing systems or manages internal queues, enabling queue-first architectures that prevent dropped events during traffic spikes. This makes it easier to handle webhook bursts without compromising performance.

Latenode also supports self-hosting, allowing teams to meet strict data residency and compliance requirements while maintaining efficient deduplication. By deploying Latenode on their own infrastructure, teams can leverage its powerful deduplication features, execution logging, and connections to over 300 integrations.

Reliable webhook deduplication eliminates the need for complex custom development and infrastructure decisions. Latenode’s unified approach - combining data storage, workflow automation, logging, and monitoring - equips developers with the tools to follow industry best practices. With features like event tracking, queuing, and secure validation, Latenode ensures that deduplication challenges are effectively managed, enabling teams to scale confidently as webhook volumes increase.

FAQs

How does Latenode help developers manage webhook deduplication effectively?

Latenode simplifies webhook deduplication for developers by offering built-in tools designed to automatically identify and manage duplicate events. With features such as unique identifiers, timestamps, and idempotency keys, developers can seamlessly integrate deduplication logic into their workflows.

This approach removes the need for writing complex custom code, ensuring dependable event handling while saving significant development time. By adopting Latenode’s efficient method, you can improve both the reliability and precision of your automation workflows.

What are the best practices for ensuring idempotency in webhook processing, and how does Latenode simplify this process?

To ensure webhook processing runs smoothly and avoids duplicating actions, it's crucial to implement idempotency. This involves using unique identifiers, such as idempotency keys or timestamps, for each event. By keeping a record of processed event IDs, you can effectively prevent duplicate handling. Additional best practices include verifying webhook signatures, checking timestamps to identify duplicates, and using retry mechanisms with queues to ensure reliable processing.

Latenode makes this process easier by providing a versatile platform where you can design workflows - either visually or through code - to manage webhook data. With Latenode, developers can efficiently implement idempotency keys, compare timestamps, and automate deduplication tasks, all within a single, streamlined environment.

Why is validating timestamps important in webhook processing, and how can Latenode help implement it effectively?

Validating timestamps during webhook processing plays a crucial role in ensuring data remains accurate and preventing outdated or duplicate events from disrupting your workflows. Since webhooks often include retry mechanisms that may resend older events, checking timestamps becomes a necessary step to maintain the integrity of your data.

Using Latenode, developers can set up workflows that automatically compare incoming event timestamps with the most recently processed data. This ensures that only the latest updates are accepted, keeping your processes clean and up-to-date. Moreover, Latenode offers support for idempotency keys, which add another layer of protection against duplicate events, allowing you to create automations that are both reliable and efficient.

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September 7, 2025
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