curl --request POST \
  --url https://eu.sequencehq.com/api/customer-aliases \
  --header 'Authorization: <authorization>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "customerId": "01849e70-703e-705a-b59a-d3fd575587e0",
  "value": "external-customer-alias-123",
  "label": "CRM ID"
}
'

import requests

url = "https://eu.sequencehq.com/api/customer-aliases"

payload = {
    "customerId": "01849e70-703e-705a-b59a-d3fd575587e0",
    "value": "external-customer-alias-123",
    "label": "CRM ID"
}
headers = {
    "Authorization": "<authorization>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: '<authorization>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    customerId: '01849e70-703e-705a-b59a-d3fd575587e0',
    value: 'external-customer-alias-123',
    label: 'CRM ID'
  })
};

fetch('https://eu.sequencehq.com/api/customer-aliases', 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://eu.sequencehq.com/api/customer-aliases",
  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([
    'customerId' => '01849e70-703e-705a-b59a-d3fd575587e0',
    'value' => 'external-customer-alias-123',
    'label' => 'CRM ID'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: <authorization>",
    "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://eu.sequencehq.com/api/customer-aliases"

	payload := strings.NewReader("{\n  \"customerId\": \"01849e70-703e-705a-b59a-d3fd575587e0\",\n  \"value\": \"external-customer-alias-123\",\n  \"label\": \"CRM ID\"\n}")

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

	req.Header.Add("Authorization", "<authorization>")
	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://eu.sequencehq.com/api/customer-aliases")
  .header("Authorization", "<authorization>")
  .header("Content-Type", "application/json")
  .body("{\n  \"customerId\": \"01849e70-703e-705a-b59a-d3fd575587e0\",\n  \"value\": \"external-customer-alias-123\",\n  \"label\": \"CRM ID\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://eu.sequencehq.com/api/customer-aliases")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = '<authorization>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"customerId\": \"01849e70-703e-705a-b59a-d3fd575587e0\",\n  \"value\": \"external-customer-alias-123\",\n  \"label\": \"CRM ID\"\n}"

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

{
  "id": "01849e70-0a0f-72ca-ba07-5557dd734d43",
  "sequenceAccountId": "ec1479a2-6ba1-421f-a7de-0853a20d17a1",
  "customerId": "01849e70-703e-705a-b59a-d3fd575587e0",
  "value": "external-customer-alias-123",
  "createdAt": "2022-10-01T00:00:00Z",
  "deletedAt": "2022-10-01T00:00:00Z",
  "label": "CRM ID",
  "archivedAt": "2022-10-01T00:00:00Z",
  "updatedAt": "2022-10-01T00:00:00Z"
}

This response has no body data.

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