Using JIRA REST-API to update a custom field

Question

I've been trying to set up a new custom webhook in Zapier, that automatically updates a custom field in JIRA, whenever a specific action occurs. I've followed some tutorials on how to do it, but when I sent the PUT request, it didn't work. I also tested a bunch in postman, but with similar results.

I used this URL:

https://bitsandbirds.atlassian.net/rest/api/3/issue/CYBIRD-1252

Here is my input:

{
   "update" : {
       "customfield_10051" : "test"
   }
}

This is what I got back:

{
    "errorMessages": [
        "Can not deserialize instance of java.util.ArrayList out of VALUE_STRING token\n at [Source: org.apache.catalina.connector.CoyoteInputStream@498ac517; line: 3, column: 8] (through reference chain: com.atlassian.jira.rest.v2.issue.IssueUpdateBean[\"update\"])"
    ]
}

Anyone know where I messed up & how to do it right?

fyi here is the view in Zapier

Answer 1

There should be

{
  "fields": {
    "customfield_10051" : "test"
  }
}