---
title: "Event Ticketing APIs and Webhooks: Delivery and Recovery"
meta_description: "Evaluate Gomry's ticketing API and webhooks: scoped access, unsigned notifications, delivery limits and recovery when a message is missed."
canonical: "https://business.gomry.com/blog/event-ticketing-api-webhooks/"
comparison_date: "2026-09-14"
primary_keyword: "event ticketing API and webhooks"
schema_type: "Article"
sources: ["https://docs.gomry.com/introduction","https://docs.gomry.com/webhooks","https://business.gomry.com/"]
internal_links: ["/blog/sell-tickets-on-your-own-website/","/blog/ai-event-management-software/","/blog/event-crm-software/"]
---

# Event Ticketing APIs and Webhooks: Delivery and Recovery

A payment notification can arrive while your CRM is unavailable. Your integration needs to record the message, recover later and avoid creating the same customer twice. It also needs a way to find the payment if the notification never arrives.

Start the API evaluation with that failure case. Check the documented resources, permissions and delivery behaviour before deciding how the systems will exchange records.

## Begin with the integration you actually need

Write one sentence per use case. For example:

- “Create an event in the ticketing platform from our CMS.”
- “Show current availability on our own public page.”
- “Create or update a contact after a permitted purchase.”
- “Reconcile payment status with our finance system each night.”
- “Notify our operations service when a particular documented event occurs.”

Each sentence should name the source of truth, data owner, update direction, acceptable delay, and what happens when the dependent system is unavailable. This prevents a team from buying a generic API to solve a requirement it has never specified.

## The production checklist

| Area | Questions a developer should be able to answer from docs and a test account |
|---|---|
| Authentication | How are credentials created, scoped, rotated, and revoked? |
| Resources | Which objects can be read or written, and what are their stable identifiers? |
| Permissions | Which scope is needed for each endpoint and who can grant it? |
| Pagination | How do list responses paginate and how is incremental sync performed? |
| Writes | Is there an idempotency mechanism or documented duplicate protection? |
| Errors | Which status codes, validation errors, and retry guidance are documented? |
| Rate limits | What limits apply and what should a client do when it reaches one? |
| Change policy | How are versions, breaking changes, and deprecations communicated? |
| Testing | Is there a safe test account, sandbox, or realistic non-production path? |
| Audit and reconciliation | How can you prove and repair the final state after a failure? |

If an answer is not documented, treat it as unknown until the vendor gives a written, current answer. “It has worked for other customers” is not an integration contract.

## Webhooks are notifications, not a complete ledger

A webhook can reduce delay, but it should not be the only source of truth for payments, admission, or irreversible workflow. A receiver should store the notification, identify it, process it safely, and reconcile against an authoritative resource or scheduled export according to the vendor’s contract.

The important questions are practical:

- Which event types exist today?
- Does delivery have a signature or another authenticated verification method?
- Are retries made, for how long, and under what conditions?
- Can the same message be delivered more than once?
- Is ordering guaranteed?
- What timeout applies to the receiving endpoint?
- Can missed messages be replayed, or must the client reconcile through the API?
- What is the schema and versioning policy for payloads?

Do not put an unverified webhook straight into a financial or access-control decision.

## Gomry's API and webhook contract

As checked on 14 September 2026, the Gomry API sits at `https://www.gomry.com/api/v1`. Keys are created in Organization Settings and sent in the X-API-KEY header; each key carries a scope map, none, read or write, per resource. Resources cover spaces, events, experiences, recurrences, ticket classes, attendees, contacts, lists, forms, applications, payments and custom fields, all paginated. [Read the API documentation](https://docs.gomry.com/introduction).

Webhooks fire on five events: payment succeeded, form response created and updated, subscription created and deleted. Delivery is best effort with a five-second timeout, payloads are not signed and there are no retries. [Read the webhook contract](https://docs.gomry.com/webhooks). Build accordingly: treat the webhook as a nudge, then confirm through the API and keep your own record of what you processed. There is no scan event today; poll attendees for check-in status.

## A safe receiving pattern

The exact implementation depends on your stack, but the operating pattern should be recognisable:

1. Validate the request format and durably store or enqueue the notification within the documented timeout.
2. Return a successful response after that durable handoff. Avoid acknowledging a message that exists only in process memory.
3. Process it from the queue, keeping only the payload and metadata needed for the workflow and avoiding secrets in logs.
4. Make the consumer idempotent: a repeated delivery should not create repeated consequences.
5. Fetch or reconcile the current authoritative state before a consequential action if the event contract does not guarantee full, ordered, signed delivery.
6. Record the outcome, alert on failures, and operate a scheduled backfill for missed notifications.

For Gomry, which documents no delivery retries, scheduled reconciliation is particularly important when the receiver was unavailable.

## API versus hosted checkout versus embed

| Approach | Best when | You own |
|---|---|---|
| Hosted page or link | Speed, supported payments, and lower engineering burden matter most | Content, links, analytics, and customer support handoff |
| Embed | The on-site journey needs tighter visual continuity | Performance, accessibility testing, analytics, and integration troubleshooting |
| API-built flow | Custom product logic is a genuine advantage | Security, validation, errors, policy, ongoing maintenance, and support |

Use the least complex supported approach that satisfies the business requirement. An API is not a quality marker if it transfers payment or event-day reliability to a small team that cannot operate it.

## Test plan before launch

Run a test with a real integration environment. Exercise expired credentials, insufficient scopes, validation error, duplicate processing, pagination beyond the first page, rate limiting, endpoint timeout, temporary downstream outage, API recovery, and a webhook that never arrives. Then show how the system repairs the final state.

Add a business test too: a customer buys, changes, is refunded, or arrives at an event. Identify which system is authoritative at each point and how support staff find it. Technical correctness that cannot be supported is not operationally complete.

## Frequently asked questions

### Why does idempotency matter?

Networks retry, users repeat actions, and messages can be delivered more than once. Idempotent handling prevents one intended outcome, such as creating a record or triggering a communication, from happening twice.

### Are webhooks enough for synchronisation?

Usually not alone. They can provide prompt notification, but robust integrations also have a reconciliation and backfill path for late, duplicate, or missed delivery.

### Is an API safer than an embed?

Neither is inherently safer. An API can create powerful custom flows but gives your team more responsibility for authentication, validation, data protection, error handling, and support. Choose based on the actual requirement and operational capacity.

### What should be documented before engineering starts?

The use case, data map, source of truth, permissions, expected volume, failure handling, retry and reconciliation policy, privacy obligations, and owners for support and incident response.

### Can a vendor roadmap satisfy a requirement?

Not for a launch-critical workflow. Decide against current, documented capabilities and contractual commitments. A future feature can be a bonus, not the dependency.

Begin with one read-only request and a test notification. Check the received record against the API, then deliberately stop the receiver and demonstrate how the integration finds what it missed. If the workflow includes an AI client, see the [MCP operations guide](/blog/ai-event-management-software/).