curl --request POST \
  --url https://api.projectcor.com/v1/contracts/{contract_id}/users \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "users": [
    {
      "id": 123,
      "dates": [
        {
          "start": "2026-01-01",
          "end": "2026-02-01"
        },
        {
          "start": "2026-01-01",
          "end": "2026-02-02"
        }
      ]
    }
  ]
}
'

import requests

url = "https://api.projectcor.com/v1/contracts/{contract_id}/users"

payload = { "users": [
        {
            "id": 123,
            "dates": [
                {
                    "start": "2026-01-01",
                    "end": "2026-02-01"
                },
                {
                    "start": "2026-01-01",
                    "end": "2026-02-02"
                }
            ]
        }
    ] }
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    users: [
      {
        id: 123,
        dates: [
          {start: '2026-01-01', end: '2026-02-01'},
          {start: '2026-01-01', end: '2026-02-02'}
        ]
      }
    ]
  })
};

fetch('https://api.projectcor.com/v1/contracts/{contract_id}/users', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

const url = 'https://api.projectcor.com/v1/contracts/{contract_id}/users';
const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    users: [
      {
        id: 123,
        dates: [
          {start: '2026-01-01', end: '2026-02-01'},
          {start: '2026-01-01', end: '2026-02-02'}
        ]
      }
    ]
  })
};

fetch(url, options)
  .then(res => res.json())
  .then(json => console.log(json))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.projectcor.com/v1/contracts/{contract_id}/users",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'users' => [
        [
                'id' => 123,
                'dates' => [
                                [
                                                                'start' => '2026-01-01',
                                                                'end' => '2026-02-01'
                                ],
                                [
                                                                'start' => '2026-01-01',
                                                                'end' => '2026-02-02'
                                ]
                ]
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

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

func main() {

	url := "https://api.projectcor.com/v1/contracts/{contract_id}/users"

	payload := strings.NewReader("{\n  \"users\": [\n    {\n      \"id\": 123,\n      \"dates\": [\n        {\n          \"start\": \"2026-01-01\",\n          \"end\": \"2026-02-01\"\n        },\n        {\n          \"start\": \"2026-01-01\",\n          \"end\": \"2026-02-02\"\n        }\n      ]\n    }\n  ]\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))

}

{
  "status": "partial_success",
  "company_id": 999,
  "contract_id": 777,
  "records_received": 8,
  "records_created": 2,
  "records_rejected": 8,
  "assigned": [
    {
      "id": 501,
      "user_id": 88001,
      "start_date": "2024-01-01T00:00:00.000Z",
      "end_date": "2024-12-31T00:00:00.000Z"
    },
    {
      "id": 502,
      "user_id": 88001,
      "start_date": "2024-03-01T00:00:00.000Z",
      "end_date": "2024-06-30T00:00:00.000Z"
    }
  ],
  "errors": [
    {
      "id": 88001,
      "dates": [
        {
          "start": "2024-06-01",
          "end": "2024-04-01",
          "message": "Date malformatted. Start date must be before end date"
        },
        {
          "start": null,
          "end": null,
          "message": "Date malformatted"
        },
        {
          "start": "2024-02-01",
          "end": null,
          "message": "Date malformatted. Start and end date are required"
        },
        {
          "start": "not-a-date",
          "end": "2024-12-31",
          "message": "Invalid date"
        },
        {
          "start": "1990-01-01",
          "end": "1990-06-30",
          "message": "Invalid contract periods. Range must be within contract start and end dates"
        }
      ],
      "message": "Partial success. Some dates were rejected"
    },
    {
      "id": "hello",
      "dates": [
        {
          "start": "2024-01-01",
          "end": "2024-12-31"
        }
      ],
      "message": "User malformatted"
    },
    {
      "id": 88002,
      "start": "2024-01-01",
      "end": "2024-12-31",
      "message": "Legacy format detected. Use \"dates\" array instead of \"start\" and \"end\" fields"
    },
    {
      "id": 88003,
      "dates": [],
      "message": "Date malformatted or empty"
    },
    {
      "id": 88004,
      "dates": [
        {
          "start": "2024-07-01",
          "end": "2024-07-01",
          "message": "Date malformatted. Start date must be before end date"
        }
      ],
      "message": "Dates are malformatted or empty"
    },
    {
      "id": 88005,
      "dates": [
        {
          "start": null,
          "end": null,
          "message": "Date malformatted"
        }
      ],
      "message": "Partial success. Some dates were rejected"
    },
    {
      "id": 999999,
      "dates": [
        {
          "start": "2024-01-01",
          "end": "2024-12-31"
        }
      ],
      "message": "User malformatted"
    },
    {
      "id": 88005,
      "dates": [
        {
          "start": "2024-01-01",
          "end": "2024-06-30"
        }
      ],
      "message": "User malformatted"
    }
  ]
}