Here is what the event looks like in the flow:

Here's a sample payload from the webhook. You can also use webhook.site to test a duplicate of your webhook.
Keep in mind that for the schema, you should only include the necessary elements, since they might not be present in other requests.
{
"changelog":
{
"id": "10017",
"items":
[
{
"field": "description",
"fieldId": "description",
"fieldtype": "jira",
"from": null,
"fromString": null,
"to": null,
"toString": "Description"
}
]
},
"issue":
{
"fields":
{
"aggregateprogress":
{
"progress": 0,
"total": 0
},
"aggregatetimeestimate": null,
"aggregatetimeoriginalestimate": null,
"aggregatetimespent": null,
"attachment":
[
],
"components":
[
],
"created": "2023-06-01T15:19:23.128+0200",
"creator":
{
"accountId": "633546b",
"accountType": "atlassian",
"active": true,
"avatarUrls":
{
"16x16": "https://secure.gravatar.com/avatar/a57d901c49916ef08bf4069638ab53b8?d=https%3A%2F%2Favatar-management--avatars.us-west-2.prod.public.atl-paas.net%2Finitials%2FJG-5.png",
"24x24": "https://secure.gravatar.com/avatar/a57d901c49916ef08bf4069638ab53b8?d=https%3A%2F%2Favatar-management--avatars.us-west-2.prod.public.atl-paas.net%2Finitials%2FJG-5.png",
"32x32": "https://secure.gravatar.com/avatar/a57d901c49916ef08bf4069638ab53b8?d=https%3A%2F%2Favatar-management--avatars.us-west-2.prod.public.atl-paas.net%2Finitials%2FJG-5.png",
"48x48": "https://secure.gravatar.com/avatar/a57d901c49916ef08bf4069638ab53b8?d=https%3A%2F%2Favatar-management--avatars.us-west-2.prod.public.atl-paas.net%2Finitials%2FJG-5.png"
},
"displayName": "J",
"self": "https://c.atlassian.net/rest/api/2/user?accountId=633546",
"timeZone": "Europe/Vienna"
},
"customfield_10001": null,
"customfield_10002": null,
"customfield_10003": null,
"customfield_10004": null,
"customfield_10005": null,
"customfield_10006": null,
"customfield_10007": null,
"customfield_10008": null,
"customfield_10009": null,
"customfield_10010": null,
"customfield_10014": null,
"customfield_10015": null,
"customfield_10016": null,
"customfield_10017": null,
"customfield_10018":
{
"hasEpicLinkFieldDependency": false,
"nonEditableReason":
{
"message": "Die \u00fcbergeordnete Verkn\u00fcpfung ist nur f\u00fcr Jira Premium-Benutzer verf\u00fcgbar.",
"reason": "PLUGIN_LICENSE_ERROR"
},
"showField": false
},
"customfield_10019": "0|i0000f:",
"customfield_10020": null,
"customfield_10021": null,
"customfield_10022": null,
"customfield_10023": null,
"customfield_10024": null,
"customfield_10025": null,
"customfield_10026": null,
"customfield_10027": null,
"customfield_10028": null,
"customfield_10029": null,
"customfield_10030": null,
"customfield_10031": null,
"customfield_10032": null,
"customfield_10033":
[
],
"customfield_10034": null,
"customfield_10035": null,
"customfield_10039": "10000",
"description": "Description",
"duedate": null,
"environment": null,
"fixVersions":
[
],
"issuelinks":
[
],
"issuerestriction":
{
"issuerestrictions":
{
},
"shouldDisplay": true
},
"issuetype":
{
"avatarId": 10318,
"description": "Tasks track small, distinct pieces of work.",
"entityId": "aa3021a9-96dd-4b9d-ab64-75267baae6be",
"hierarchyLevel": 0,
"iconUrl": "https://c.atlassian.net/rest/api/2/universal_avatar/view/type/issuetype/avatar/10318?size=medium",
"id": "10001",
"name": "Task",
"self": "https://c.atlassian.net/rest/api/2/issuetype/10001",
"subtask": false
},
"labels":
[
],
"lastViewed": "2023-06-02T09:20:24.703+0200",
"priority":
{
"iconUrl": "https://c.atlassian.net/images/icons/priorities/medium.svg",
"id": "3",
"name": "Medium",
"self": "https://c.atlassian.net/rest/api/2/priority/3"
},
"progress":
{
"progress": 0,
"total": 0
},
"project":
{
"avatarUrls":
{
"16x16": "https://c.atlassian.net/rest/api/2/universal_avatar/view/type/project/avatar/10410?size=xsmall",
"24x24": "https://c.atlassian.net/rest/api/2/universal_avatar/view/type/project/avatar/10410?size=small",
"32x32": "https://c.atlassian.net/rest/api/2/universal_avatar/view/type/project/avatar/10410?size=medium",
"48x48": "https://c.atlassian.net/rest/api/2/universal_avatar/view/type/project/avatar/10410"
},
"id": "10000",
"key": "SND",
"name": "Sandbox",
"projectTypeKey": "software",
"self": "https://c.atlassian.net/rest/api/2/project/10000",
"simplified": true
},
"reporter":
{
"accountId": "633546b",
"accountType": "atlassian",
"active": true,
"avatarUrls":
{
"16x16": "https://secure.gravatar.com/avatar/a57d901c49916ef08bf4069638ab53b8?d=https%3A%2F%2Favatar-management--avatars.us-west-2.prod.public.atl-paas.net%2Finitials%2FJG-5.png",
"24x24": "https://secure.gravatar.com/avatar/a57d901c49916ef08bf4069638ab53b8?d=https%3A%2F%2Favatar-management--avatars.us-west-2.prod.public.atl-paas.net%2Finitials%2FJG-5.png",
"32x32": "https://secure.gravatar.com/avatar/a57d901c49916ef08bf4069638ab53b8?d=https%3A%2F%2Favatar-management--avatars.us-west-2.prod.public.atl-paas.net%2Finitials%2FJG-5.png",
"48x48": "https://secure.gravatar.com/avatar/a57d901c49916ef08bf4069638ab53b8?d=https%3A%2F%2Favatar-management--avatars.us-west-2.prod.public.atl-paas.net%2Finitials%2FJG-5.png"
},
"displayName": "Jakob Gillinger",
"self": "https://c.atlassian.net/rest/api/2/user?accountId=633546b",
"timeZone": "Europe/Vienna"
},
"resolution": null,
"resolutiondate": null,
"security": null,
"status":
{
"description": "",
"iconUrl": "https://c.atlassian.net/",
"id": "10000",
"name": "To Do",
"self": "https://c.atlassian.net/rest/api/2/status/10000",
"statusCategory":
{
"colorName": "blue-gray",
"id": 2,
"key": "new",
"name": "New",
"self": "https://c.atlassian.net/rest/api/2/statuscategory/2"
}
},
"statuscategorychangedate": "2023-06-01T15:19:23.685+0200",
"subtasks":
[
],
"summary": "New Automate Test",
"timeestimate": null,
"timeoriginalestimate": null,
"timespent": null,
"timetracking":
{
},
"updated": "2023-06-02T09:59:42.197+0200",
"versions":
[
],
"votes":
{
"hasVoted": false,
"self": "https://c.atlassian.net/rest/api/2/issue/SND-3/votes",
"votes": 0
},
"watches":
{
"isWatching": true,
"self": "https://c.atlassian.net/rest/api/2/issue/SND-3/watchers",
"watchCount": 1
},
"workratio": -1
},
"id": "10002",
"key": "SND-3",
"self": "https://c.atlassian.net/rest/api/2/10002"
},
"issue_event_type_name": "issue_updated",
"timestamp": 1685692782236,
"user":
{
"accountId": "633546b",
"accountType": "atlassian",
"active": true,
"avatarUrls":
{
"16x16": "https://secure.gravatar.com/avatar/a57d901c49916ef08bf4069638ab53b8?d=https%3A%2F%2Favatar-management--avatars.us-west-2.prod.public.atl-paas.net%2Finitials%2FJG-5.png",
"24x24": "https://secure.gravatar.com/avatar/a57d901c49916ef08bf4069638ab53b8?d=https%3A%2F%2Favatar-management--avatars.us-west-2.prod.public.atl-paas.net%2Finitials%2FJG-5.png",
"32x32": "https://secure.gravatar.com/avatar/a57d901c49916ef08bf4069638ab53b8?d=https%3A%2F%2Favatar-management--avatars.us-west-2.prod.public.atl-paas.net%2Finitials%2FJG-5.png",
"48x48": "https://secure.gravatar.com/avatar/a57d901c49916ef08bf4069638ab53b8?d=https%3A%2F%2Favatar-management--avatars.us-west-2.prod.public.atl-paas.net%2Finitials%2FJG-5.png"
},
"displayName": "Jakob Gillinger",
"self": "https://c.atlassian.net/rest/api/2/user?accountId=633546b",
"timeZone": "Europe/Vienna"
},
"webhookEvent": "jira:issue_updated"
}