curl --request POST \
  --url https://api.example.com/api/v1/connected-accounts/{id}/onboarding \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "redirect_url": "<string>"
}
'

{
  "expires_at": "2023-11-07T05:31:56Z",
  "url": "<string>"
}