Create a Jira issue via REST API v3 with an ADF description

Documented steps

1. POST https://your-domain.atlassian.net/rest/api/3/issue with minimum body {"fields":{"project":{"id":"10000"},"issuetype":{"id":"10000"},"summary":"Main order flow broken"}} (project/issuetype accept id or key).
2. description must be an ADF doc, not a string: {"type":"doc","version":1,"content":[{"type":"paragraph","content":[{"type":"text","text":"Order entry fails when selecting supplier."}]}]}.
3. Discover accepted issue types/fields first: GET /rest/api/3/issue/createmeta/{projectIdOrKey}/issuetypes, then GET .../issuetypes/{issueTypeId} for field metadata.
4. Do not use GET /rest/api/3/issue/createmeta?expand=... — deprecated per the OpenAPI spec (see the Create Issue Meta Endpoint Deprecation Notice changelog); use the two split endpoints above.
5. Send Content-Type: application/json with Basic auth (email:API token) or OAuth2 write:jira-work; success is 201 with {id, key, self}.
6. Optional fields in the same object: assignee {"accountId":...}, labels, priority, components, versions/fixVersions, duedate, timetracking, parent (subtasks: issuetype must be a subtask type AND parent.key/id set).
7. Official docs: https://developer.atlassian.com/cloud/jira/platform/rest/v3/api-group-issues/#api-rest-api-3-issue-post and https://developer.atlassian.com/cloud/jira/platform/apis/document/structure/