Original request description:

Problem Definition

Currently the JIRA REST API does not support creating projects using a Shared Configuration. The only way to do this is through the JIRA Project Creation UI.

Suggested Solution

Allow creating projects with Shared Configuration through REST API.

Workaround

Option 1

JIRA CLI Plugin can also create projects via scripting, but with more flexibility of setting the schemes: https://appfire.atlassian.net/wiki/spaces/JCLI/pages/70782732/Examples#Examples-createProject

Option 2

To create a new Project with existing configuration from another project, we can use the following JSON keys in the existing /rest/api/3/project API call.

• issueSecurityScheme
• permissionScheme
• notificationScheme
• workflowScheme
• issueTypeScreenScheme
• issueTypeScheme
• fieldConfigurationScheme

not all of them are needed to be added. If you don't mention one, it'll be assigned the default scheme.
you can't use projectTemplateKey JSON key with the above keys.

The above keys needs the id of the existing configuration item. You can lookup the ID by using the following REST API endpoints.

Then, use the id with the create project API call. Here's an example call -

curl --request POST \
  --url 'https://<site_name>.atlassian.net/rest/api/3/project' \
  --header 'Authorization: Basic <base64_code>' \
  --header 'Content-Type: application/json' \
  --data '{
	"key": "ABCD",
	"name": "ABCD Project",
	"projectTypeKey": "software",
	"permissionScheme" : 10001,
        "notificationScheme" : 10000,
        "workflowScheme" : 10006,
        "issueTypeScreenScheme" : 10005,
        "issueTypeScheme" : 10142,
        "fieldConfigurationScheme" : 10003
}'