# Knowledgebase

Articles written to help you understand the AccessGrid platform.

## 4 guides

- [**How to set up webhooks on AccessGrid**](/content/guides/knowledgebase/how-to-set-up-webhooks-on-accessgrid/index.html)  
  Get a handle on how webhooks are sent from the AccessGrid platform. We'll cover event types, URL verification, cloud event standards and more for when a mobile wallet related event gets fired on yo...

- [**Understanding the image dimensions necessary for Google and Apple passes**](/content/guides/knowledgebase/understanding-the-image-dimensions-necessary-for-google-and-apple-passes/index.html)  
  Learn about the image requirements for Apple + Google passes in this knowledgebase article

- [**How the state transitions work for passes on AccessGrid**](/content/guides/knowledgebase/how-the-state-transitions-work-for-passes-on-accessgrid/index.html)  
  This guide will walk you through how the state transitions work for passes on AccessGrid.

- [**AccessGrid DESFire application structures**](/content/guides/knowledgebase/accessgrid-desfire-application-structures/index.html)  
  The goal of this guide is to show you how our DESFIRE application structure works