Create project in Jira using Rest API

Question

"ket": "DEMOCREATE",
    "name":"DEMO ",
    "projectTypeKey":"business",
    "projectTemplateKey":"com.atlassian.jira-core-project-templates:jira-core-simplified-procurement",
    "description":"Rest Demo Project",
    "leadAccountId":"",
    "url":"",
    "assigneeType":"PROJECT_LEAD",
    "avatarId":1250
}

Tried to create a project using python rest-api and tested in the postman got 404 error, wants tp know what are the exact thing that have to fill in the "leadAccountId":"", "url":"",, your text and want to know what are fields mandatory while creating project or issue for json objects?