Clio Custom Actions API

In Clio, applications can create custom actions in our interface. Links are unique across an application, user, location in the UI (`ui_reference`) and label. When the user clicks on a custom action, Clio will open a new browser tab at the `target_url`.Clio will add a few URL parameters to the `target_url`, including the custom action ID, the ID of the user who clicked the link and the URL of the object(s) which the link was clicked on. The third party application must then look up the relevant OAuth token associated with the user and custom action, and make an authenticated request to the `subject_url`. This request both lets you validate the request was made by who you expected, that they have access to the record and lets you pull down any extra information you may need.Currently supported for: Activities, Contacts, Documents and Matters## Security### Confirming a User's ActionAs custom actions require an unauthorized GET request, which can be faked, Clio has provided a way to validate that a user has actually performed an action.When a request is sent to the URL specified on the custom action, we will include a `custom_action_nonce` parameter. If you send us back the `custom_action_nonce` in your next request to the API, Clio will use it to validate that the user who clicked the custom action matches your oauth token request. If no match is made, an error will be returned.