curl --request POST \
  --url https://api.metal.ai/v1/data/observations/batch \
  --header 'Content-Type: application/json' \
  --header 'x-metal-api-key: <api-key>' \
  --header 'x-metal-client-id: <api-key>' \
  --data '
{
  "requests": [
    {
      "resource": "<string>",
      "key": "<string>",
      "dealContext": "<string>",
      "policy": "<string>"
    }
  ]
}
'

{
  "data": [
    {
      "resource": "<string>",
      "key": "<string>",
      "value": "<unknown>",
      "provenance": {}
    }
  ]
}