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": "id;value;ccy;posted_at\nA1;10,50;BRL;2025-06-01\n",
  "format": "csv",
  "hints": {}
}
'

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://matcher.sandbox.lerian.net/v1/imports/contexts/{contextId}/sources/{sourceId}/mapping-proposal"

	payload := strings.NewReader("{\n  \"sample\": \"id;value;ccy;posted_at\\nA1;10,50;BRL;2025-06-01\\n\",\n  \"format\": \"csv\",\n  \"hints\": {}\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    sample: 'id;value;ccy;posted_at\nA1;10,50;BRL;2025-06-01\n',
    format: 'csv',
    hints: {}
  })
};

fetch('https://matcher.sandbox.lerian.net/v1/imports/contexts/{contextId}/sources/{sourceId}/mapping-proposal', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://matcher.sandbox.lerian.net/v1/imports/contexts/{contextId}/sources/{sourceId}/mapping-proposal"

payload = {
    "sample": "id;value;ccy;posted_at
A1;10,50;BRL;2025-06-01
",
    "format": "csv",
    "hints": {}
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

{
  "fields": [
    {
      "canonicalKey": "amount",
      "confidence": 0.92,
      "rationale": "numeric column with comma decimal",
      "sourceColumn": "value"
    }
  ],
  "dialect": {
    "dateStyle": "iso",
    "decimalStyle": "comma",
    "delimiter": "semicolon",
    "encoding": "utf-8"
  },
  "mapping": {}
}

{
  "code": "ERR-0001",
  "detail": "Property foo is required but is missing.",
  "errors": [
    {
      "location": "<string>",
      "message": "<string>",
      "value": "<unknown>"
    }
  ],
  "instance": "https://example.com/error-log/abc123",
  "status": 400,
  "title": "Bad Request",
  "type": "https://example.com/errors/example"
}