How to pass the request to call the new API "Bulk update workflows"

Hi,
I am trying to create a new custom issue type and the related actions with REST API.
As per the documentation it is mentioned as we have to use this new API instead of “Create Workflow”. But the request object mentioned in the document is bit complicate to understand for me and I have tried to use the sample payload in Postman and I got the below error:
{
“errorMessages”: [
“Initial transitions must have a destination status.”,
“Transition must specify a links field. If the transition has no links, the links field should be an empty array. If you are using to/from fields on transitions, these are no longer supported.”
],
“errors”: {}
}
If anyone used this API, please help me with the sample payload.
And also I am struggling to understand the complete workflow from Creation of custom issue type to the last step to make it available to any project in the system, please let me know the workflow with the API for the steps if possible.
Thanks in advance,
Kavitha