How to pass any JIRA REST API parameters via Webhooks?

[Aleksandr Karev]

Hi, everybody!
I wonder is it possible to pass any JIRA REST API parameter via Webhooks from another application to JIRA.

I would like to do a JIRA transition (or update an issue field value) by GitLab Webhooks.
For example:
curl -D- -u USER:PASS -X POST --data ‘{“transition”:{“id”:“TRANSITION_ID”}}’ -H “Content-Type: application/json” JIRA_URL:JIRA_PORT/rest/api/latest/issue/<JIRA_ISSUE>/transitions?expand=transitions.fields
(it given from https://community.atlassian.com/t5/Jira-questions/JIRA-How-to-change-issue-status-via-rest/qaq-p/528133)

If webhooks a common tool witch used to send POST request(REST API) to application aside, is it means what I can pass any REST API parameters to another application?

As I know webhooks can pass REST API parameter only in query strings using ‘?’ and ‘&’ sign. But often REST API documentation gives you info how to pass parameters only via a request body(JSON).
(e.g. https://developer.atlassian.com/server/jira/platform/rest-apis/)
But I can’t use it in webhooks. Sometime I just trying to pass those parameters via query string and it goes well, but in case of a transition I can’t do it.

So I confused.
Can I use Webhook to pass any parameters to JIRA or not? Is there a special key to include a request body(JSON) in webhooks as in cURL command “–data”,"-d" key?
Or it is impossible at all and I can pass via query strings only some parameters and other via request body(JSON)?

Could somebody help me to figure out with Webhooks and JIRA REST API?

[Aleksandr Karev]

One of version of my question:

Is it possible to pass each JIRA REST API parameter via URI by "query string"?

[Aleksandr Karev]

Hi!

Eventually after some investigation and talking this other specialists I came to the conclusion that there is no way to set up parameters higher than second layer of the structure via Webhook