setIssueProperty

PUT /rest/api/3/issue/{issueIdOrKey}/properties/{propertyKey} HTTP/1.1

{
  "issueIdOrKey": {
    "description": "The ID or key of the issue.",
    "required": true,
    "location": "path",
    "type": "string"
  },
  "propertyKey": {
    "description": "The key of the issue property. The maximum length is 255 characters.",
    "required": true,
    "location": "path",
    "type": "string"
  }
}

{}