Create a new issue in a different Jira Cloud instance

This article provides the code snippet to create a new issue in a different Jira Cloud instance using callRest filter and Atlassian Jira REST API

Instructions

Navigate to the intended workflow to make the necessary changes in the edit mode.
Select the required transition.
Select the Post functions tab and click Add post function.
Add the Build-your-own (scripted) Post-function post-function with the below template:
{{ "https://<URL>/rest/api/3/issue" | callRest(verb=("post"), body= { "fields": { "project": { "key":"JSM" }, "summary": "From JMWE post-function", "issuetype": { "id": "10006" }, "customfield_10064": "val 1" } }, options= { headers: { "authorization": "Basic XXXXXXXXXX" } }) | dump(2) }}

Replace:

<URL> in line #1 with the target Jira Cloud instance URL
JSM in line #5 with the target project key
From JMWE post-function in line #7 with the desired summary
10006 in line #9 with the target issue type id
10064 and val 1 in line #11 with the id and value of a customfield that you want to set in the new issue. Add other fields as needed (check this)
XXXXXXXXXX in line #16 with your API token - check this.