curl --request POST \
  --url https://api.getsly.ai/v1/v1/ucp/checkouts/batch-complete \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "checkout_ids": [
    "<string>"
  ],
  "payment_method_id": "<string>"
}
'

{
  "total": 123,
  "completed": 123,
  "failed": 123,
  "results": [
    {
      "checkout_id": "<string>",
      "status": "<string>",
      "error": "<string>"
    }
  ]
}