You can obtain the project ID by calling the API to query project information. The API is GET https://{Endpoint}/v3/projects, in which {Endpoint} is the IAM endpoint and can be obtained from IAM documentation.
For details about API authentication, see Authentication.
The following is a response example. The value of id under projects is the project ID. If multiple IDs are returned, obtain the desired one based on your actual region (name).
{ "projects": [ { "domain_id": "65382450e8f64ac0870cd180d14e684b", "is_domain": false, "parent_id": "65382450e8f64ac0870cd180d14e684b", "name": "region-name", "description": "", "links": { "next": null, "previous": null, "self": "https://www.example.com/v3/projects/a4a5d4098fb4474fa22cd05f897d6b99" }, "id": "a4a5d4098fb4474fa22cd05f897d6b99", "enabled": true } ], "links": { "next": null, "previous": null, "self": "https://www.example.com/v3/projects" } }