curl --request POST \
  --url https://api.dualship.run/api/v1/billing/checkout \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "interval": "monthly",
  "plan_slug": "hobby",
  "workspace_id": "<string>"
}
'

{
  "session_id": "<string>",
  "url": "<string>"
}