curl --request POST \
  --url https://matcher.sandbox.lerian.net/v1/imports/contexts/{contextId}/sources/{sourceId}/mapping-proposal \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "sample": "<string>",
  "hints": {}
}
'

{
  "fields": [
    {
      "canonicalKey": "<string>",
      "confidence": 0.5,
      "rationale": "<string>",
      "sourceColumn": "<string>"
    }
  ],
  "dialect": {
    "dateStyle": "<string>",
    "decimalStyle": "<string>",
    "delimiter": "<string>",
    "encoding": "<string>"
  },
  "mapping": {}
}