curl --request POST \
  --url https://app.specurate.com/api/v1/workspaces/{workspaceId}/collections/{id}/entries/{entryId}/reference-items \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "source": {
    "kind": "catalog_item",
    "catalogItemId": "<string>",
    "catalogFamilySourceId": "<string>"
  },
  "entryVersion": 123,
  "collectionVersion": 123
}
'

import requests

url = "https://app.specurate.com/api/v1/workspaces/{workspaceId}/collections/{id}/entries/{entryId}/reference-items"

payload = {
    "source": {
        "kind": "catalog_item",
        "catalogItemId": "<string>",
        "catalogFamilySourceId": "<string>"
    },
    "entryVersion": 123,
    "collectionVersion": 123
}
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({
    source: {
      kind: 'catalog_item',
      catalogItemId: '<string>',
      catalogFamilySourceId: '<string>'
    },
    entryVersion: 123,
    collectionVersion: 123
  })
};

fetch('https://app.specurate.com/api/v1/workspaces/{workspaceId}/collections/{id}/entries/{entryId}/reference-items', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://app.specurate.com/api/v1/workspaces/{workspaceId}/collections/{id}/entries/{entryId}/reference-items",
  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([
    'source' => [
        'kind' => 'catalog_item',
        'catalogItemId' => '<string>',
        'catalogFamilySourceId' => '<string>'
    ],
    'entryVersion' => 123,
    'collectionVersion' => 123
  ]),
  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://app.specurate.com/api/v1/workspaces/{workspaceId}/collections/{id}/entries/{entryId}/reference-items"

	payload := strings.NewReader("{\n  \"source\": {\n    \"kind\": \"catalog_item\",\n    \"catalogItemId\": \"<string>\",\n    \"catalogFamilySourceId\": \"<string>\"\n  },\n  \"entryVersion\": 123,\n  \"collectionVersion\": 123\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))

}

HttpResponse<String> response = Unirest.post("https://app.specurate.com/api/v1/workspaces/{workspaceId}/collections/{id}/entries/{entryId}/reference-items")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"source\": {\n    \"kind\": \"catalog_item\",\n    \"catalogItemId\": \"<string>\",\n    \"catalogFamilySourceId\": \"<string>\"\n  },\n  \"entryVersion\": 123,\n  \"collectionVersion\": 123\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://app.specurate.com/api/v1/workspaces/{workspaceId}/collections/{id}/entries/{entryId}/reference-items")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"source\": {\n    \"kind\": \"catalog_item\",\n    \"catalogItemId\": \"<string>\",\n    \"catalogFamilySourceId\": \"<string>\"\n  },\n  \"entryVersion\": 123,\n  \"collectionVersion\": 123\n}"

response = http.request(request)
puts response.read_body

{
  "item": {
    "kind": "catalog_item",
    "catalogItemId": "<string>",
    "catalogFamilySourceId": "<string>",
    "catalogAttributes": {
      "family": {},
      "item": {},
      "familySource": {},
      "itemSource": {}
    },
    "catalogFamilyVersion": 123,
    "catalogItemVersion": 123,
    "catalogItemSourceVersion": 123,
    "id": "<string>",
    "referenceCode": "<string>",
    "name": "<string>",
    "vendorName": "<string>",
    "sourceLabel": "<string>",
    "imageUrl": "<string>",
    "available": true,
    "status": "draft",
    "position": 123,
    "version": 123,
    "dimensions": "<string>",
    "finish": "<string>",
    "quantity": "<string>",
    "price": "<string>",
    "writableValueFields": [
      "finish"
    ],
    "materialsCount": 123,
    "partsCount": 123,
    "componentsCount": 123
  },
  "created": true,
  "entryVersion": 123,
  "collectionVersion": 123
}