vm id

Hello! i had to edit some of my VMs and change their IDs because i accidently restored a wrong, old backup with an identical VM-ID. So i changed them to be unique which actually worked pretty well. But now i realized that with the changed IDs i cannot use my previously created backups on my PBS...

Web UI shows me the recommended virtual machine id: How can I get this recommended ID via Proxmox API in order to avoid collisions while creating virtual machines? The best scenario of course is when I can send POST request without specifying vm id myself and let proxmox assign it for me...