curl --request POST \
  --url https://test.api.cxconnect.ai/language/substitute \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "document": {
    "value": "<string>",
    "mime_type": "<string>",
    "language": "<string>",
    "meta": {}
  },
  "substitutions": [
    {
      "source": "<string>",
      "text": "<string>",
      "target": "<string>",
      "substitution": "<string>"
    }
  ],
  "meta": {
    "foo": "bar"
  }
}'

{
  "document": {
    "value": "<string>",
    "mime_type": "<string>",
    "language": "<string>",
    "meta": {}
  },
  "original": {
    "value": "<string>",
    "mime_type": "<string>",
    "language": "<string>",
    "meta": {}
  },
  "meta": {
    "foo": "bar"
  }
}