curl --request POST \
  --url https://pub-api.conversion.ai/api/v2/fields/relationships \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "source": {
    "objectType": "CUSTOM_OBJECT",
    "customObjectId": "528f0cc5-431c-4f3b-9d3c-7204740a3f76",
    "key": "organization",
    "label": "Organization"
  },
  "target": {
    "objectType": "CUSTOM_OBJECT",
    "customObjectId": "f4f9ae15-12e8-4b3f-9822-22166d455f40",
    "key": "dashboard_users",
    "label": "Dashboard Users"
  }
}
'

import requests

url = "https://pub-api.conversion.ai/api/v2/fields/relationships"

payload = {
    "source": {
        "objectType": "CUSTOM_OBJECT",
        "customObjectId": "528f0cc5-431c-4f3b-9d3c-7204740a3f76",
        "key": "organization",
        "label": "Organization"
    },
    "target": {
        "objectType": "CUSTOM_OBJECT",
        "customObjectId": "f4f9ae15-12e8-4b3f-9822-22166d455f40",
        "key": "dashboard_users",
        "label": "Dashboard Users"
    }
}
headers = {
    "X-API-Key": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-API-Key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    source: {
      objectType: 'CUSTOM_OBJECT',
      customObjectId: '528f0cc5-431c-4f3b-9d3c-7204740a3f76',
      key: 'organization',
      label: 'Organization'
    },
    target: {
      objectType: 'CUSTOM_OBJECT',
      customObjectId: 'f4f9ae15-12e8-4b3f-9822-22166d455f40',
      key: 'dashboard_users',
      label: 'Dashboard Users'
    }
  })
};

fetch('https://pub-api.conversion.ai/api/v2/fields/relationships', 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://pub-api.conversion.ai/api/v2/fields/relationships",
  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' => [
        'objectType' => 'CUSTOM_OBJECT',
        'customObjectId' => '528f0cc5-431c-4f3b-9d3c-7204740a3f76',
        'key' => 'organization',
        'label' => 'Organization'
    ],
    'target' => [
        'objectType' => 'CUSTOM_OBJECT',
        'customObjectId' => 'f4f9ae15-12e8-4b3f-9822-22166d455f40',
        'key' => 'dashboard_users',
        'label' => 'Dashboard Users'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-API-Key: <api-key>"
  ],
]);

$response = curl_exec($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://pub-api.conversion.ai/api/v2/fields/relationships"

	payload := strings.NewReader("{\n  \"source\": {\n    \"objectType\": \"CUSTOM_OBJECT\",\n    \"customObjectId\": \"528f0cc5-431c-4f3b-9d3c-7204740a3f76\",\n    \"key\": \"organization\",\n    \"label\": \"Organization\"\n  },\n  \"target\": {\n    \"objectType\": \"CUSTOM_OBJECT\",\n    \"customObjectId\": \"f4f9ae15-12e8-4b3f-9822-22166d455f40\",\n    \"key\": \"dashboard_users\",\n    \"label\": \"Dashboard Users\"\n  }\n}")

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

	req.Header.Add("X-API-Key", "<api-key>")
	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://pub-api.conversion.ai/api/v2/fields/relationships")
  .header("X-API-Key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"source\": {\n    \"objectType\": \"CUSTOM_OBJECT\",\n    \"customObjectId\": \"528f0cc5-431c-4f3b-9d3c-7204740a3f76\",\n    \"key\": \"organization\",\n    \"label\": \"Organization\"\n  },\n  \"target\": {\n    \"objectType\": \"CUSTOM_OBJECT\",\n    \"customObjectId\": \"f4f9ae15-12e8-4b3f-9822-22166d455f40\",\n    \"key\": \"dashboard_users\",\n    \"label\": \"Dashboard Users\"\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://pub-api.conversion.ai/api/v2/fields/relationships")

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

request = Net::HTTP::Post.new(url)
request["X-API-Key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"source\": {\n    \"objectType\": \"CUSTOM_OBJECT\",\n    \"customObjectId\": \"528f0cc5-431c-4f3b-9d3c-7204740a3f76\",\n    \"key\": \"organization\",\n    \"label\": \"Organization\"\n  },\n  \"target\": {\n    \"objectType\": \"CUSTOM_OBJECT\",\n    \"customObjectId\": \"f4f9ae15-12e8-4b3f-9822-22166d455f40\",\n    \"key\": \"dashboard_users\",\n    \"label\": \"Dashboard Users\"\n  }\n}"

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

{
  "data": {
    "sourceField": {
      "key": "organization",
      "objectType": "CUSTOM_OBJECT",
      "customObjectId": "528f0cc5-431c-4f3b-9d3c-7204740a3f76"
    },
    "relatedFields": [
      {
        "key": "dashboard_users",
        "objectType": "CUSTOM_OBJECT",
        "customObjectId": "f4f9ae15-12e8-4b3f-9822-22166d455f40"
      }
    ]
  }
}

{
  "error": {
    "code": "invalid_email",
    "message": "invalid email format: not-an-email"
  }
}

{
  "error": {
    "code": "invalid_email",
    "message": "invalid email format: not-an-email"
  }
}

{
  "error": {
    "code": "invalid_email",
    "message": "invalid email format: not-an-email"
  }
}

{
  "error": {
    "code": "invalid_email",
    "message": "invalid email format: not-an-email"
  }
}

{
  "error": {
    "code": "invalid_email",
    "message": "invalid email format: not-an-email"
  }
}