curl -X POST "https://api.alura.io/v1/research/saved/lists/lst_0000000000000000000000001B/items" \
  -H "Authorization: Bearer $ALURA_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: 5f0c8e2a-4b1d-4c3e-9a7f-2b5d6e8f0a1c" \
  -d '{"items":[{"type":"product","ref_id":"4524717183"},{"type":"keyword","ref_id":"88123"}]}'

const res = await fetch('https://api.alura.io/v1/research/saved/lists/lst_0000000000000000000000001B/items', {
  method: 'POST',
  headers: {
    Authorization: `Bearer ${process.env.ALURA_API_KEY}`,
    'Content-Type': 'application/json',
    'Idempotency-Key': '5f0c8e2a-4b1d-4c3e-9a7f-2b5d6e8f0a1c',
  },
  body: JSON.stringify({
    "items": [
      {
        "type": "product",
        "ref_id": "4524717183"
      },
      {
        "type": "keyword",
        "ref_id": "88123"
      }
    ]
  }),
});
console.log(await res.json());

import json
import os
import urllib.request

request = urllib.request.Request(
    "https://api.alura.io/v1/research/saved/lists/lst_0000000000000000000000001B/items",
    method="POST",
    data=json.dumps({
      "items": [
        {
          "type": "product",
          "ref_id": "4524717183"
        },
        {
          "type": "keyword",
          "ref_id": "88123"
        }
      ]
    }).encode(),
    headers={
        "Authorization": f"Bearer {os.environ['ALURA_API_KEY']}",
        "Content-Type": "application/json",
        "Idempotency-Key": "5f0c8e2a-4b1d-4c3e-9a7f-2b5d6e8f0a1c",
    },
)
with urllib.request.urlopen(request) as response:
    print(json.load(response))

{
  "object": "research.saved_items_added",
  "list_id": "lst_0000000000000000000000001B",
  "added": 2,
  "unchanged": 0,
  "items": [
    {
      "id": "itm_00000000000000000004000034",
      "type": "product",
      "ref_id": "4524717183"
    },
    {
      "id": "itm_0000000000000000000C000035",
      "type": "keyword",
      "ref_id": "88123"
    }
  ]
}

{
  "type": "https://docs.alura.io/errors/invalid_request",
  "title": "Invalid request",
  "status": 400,
  "code": "invalid_request",
  "detail": "Invalid request",
  "suggestion": "Fix the request as the detail says, then send it again.",
  "retryable": false,
  "request_id": "req_01JQ5W3H8M2N4P6R8T0V2X4Z6B"
}

{
  "type": "https://docs.alura.io/errors/unauthorized",
  "title": "Unauthorized",
  "status": 401,
  "code": "unauthorized",
  "detail": "Unauthorized",
  "suggestion": "Send a valid API key as `Authorization: Bearer alura_sk_...`.",
  "retryable": false,
  "request_id": "req_01JQ5W3H8M2N4P6R8T0V2X4Z6B"
}

{
  "type": "https://docs.alura.io/errors/credits_exhausted",
  "title": "API credits exhausted",
  "status": 402,
  "code": "credits_exhausted",
  "detail": "API credits exhausted",
  "suggestion": "Upgrade the plan or wait for the monthly reset.",
  "retryable": false,
  "request_id": "req_01JQ5W3H8M2N4P6R8T0V2X4Z6B"
}

{
  "type": "https://docs.alura.io/errors/plan_required",
  "title": "Plan required",
  "status": 403,
  "code": "plan_required",
  "detail": "Plan required",
  "suggestion": "Upgrade the workspace plan to use this operation.",
  "retryable": false,
  "request_id": "req_01JQ5W3H8M2N4P6R8T0V2X4Z6B"
}

{
  "type": "https://docs.alura.io/errors/not_found",
  "title": "Not found",
  "status": 404,
  "code": "not_found",
  "detail": "Not found",
  "suggestion": "Check the ID, or search for it first.",
  "retryable": false,
  "request_id": "req_01JQ5W3H8M2N4P6R8T0V2X4Z6B"
}

{
  "type": "https://docs.alura.io/errors/method_not_allowed",
  "title": "Method not allowed",
  "status": 405,
  "code": "method_not_allowed",
  "detail": "Method not allowed",
  "suggestion": "Use one of the methods in the Allow header.",
  "retryable": false,
  "request_id": "req_01JQ5W3H8M2N4P6R8T0V2X4Z6B"
}

{
  "type": "https://docs.alura.io/errors/conflict",
  "title": "Conflict",
  "status": 409,
  "code": "conflict",
  "detail": "Conflict",
  "suggestion": "Reload the resource and retry with its current state.",
  "retryable": false,
  "request_id": "req_01JQ5W3H8M2N4P6R8T0V2X4Z6B"
}

{
  "type": "https://docs.alura.io/errors/rate_limited",
  "title": "Rate limited",
  "status": 429,
  "code": "rate_limited",
  "detail": "Rate limited",
  "suggestion": "Wait for Retry-After, then retry.",
  "retryable": true,
  "request_id": "req_01JQ5W3H8M2N4P6R8T0V2X4Z6B"
}

{
  "type": "https://docs.alura.io/errors/internal_error",
  "title": "Internal error",
  "status": 500,
  "code": "internal_error",
  "detail": "Internal error",
  "suggestion": "Retry; if it keeps failing, report the request_id.",
  "retryable": true,
  "request_id": "req_01JQ5W3H8M2N4P6R8T0V2X4Z6B"
}

{
  "type": "https://docs.alura.io/errors/credits_unavailable",
  "title": "API credits unavailable",
  "status": 503,
  "code": "credits_unavailable",
  "detail": "API credits unavailable",
  "suggestion": "Retry shortly.",
  "retryable": true,
  "request_id": "req_01JQ5W3H8M2N4P6R8T0V2X4Z6B"
}