curl --request POST \
  --url https://api.attio.com/v2/activities \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "data": {
    "api_slug": "site_visits",
    "singular_noun": "Site visit",
    "plural_noun": "Site visits",
    "extends": "interactions"
  }
}
'

import requests

url = "https://api.attio.com/v2/activities"

payload = { "data": {
        "api_slug": "site_visits",
        "singular_noun": "Site visit",
        "plural_noun": "Site visits",
        "extends": "interactions"
    } }
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({
    data: {
      api_slug: 'site_visits',
      singular_noun: 'Site visit',
      plural_noun: 'Site visits',
      extends: 'interactions'
    }
  })
};

fetch('https://api.attio.com/v2/activities', 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://api.attio.com/v2/activities",
  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([
    'data' => [
        'api_slug' => 'site_visits',
        'singular_noun' => 'Site visit',
        'plural_noun' => 'Site visits',
        'extends' => 'interactions'
    ]
  ]),
  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.attio.com/v2/activities"

	payload := strings.NewReader("{\n  \"data\": {\n    \"api_slug\": \"site_visits\",\n    \"singular_noun\": \"Site visit\",\n    \"plural_noun\": \"Site visits\",\n    \"extends\": \"interactions\"\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))

}

HttpResponse<String> response = Unirest.post("https://api.attio.com/v2/activities")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"data\": {\n    \"api_slug\": \"site_visits\",\n    \"singular_noun\": \"Site visit\",\n    \"plural_noun\": \"Site visits\",\n    \"extends\": \"interactions\"\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.attio.com/v2/activities")

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  \"data\": {\n    \"api_slug\": \"site_visits\",\n    \"singular_noun\": \"Site visit\",\n    \"plural_noun\": \"Site visits\",\n    \"extends\": \"interactions\"\n  }\n}"

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

{
  "data": {
    "id": {
      "workspace_id": "14beef7a-99f7-4534-a87e-70b564330a4c",
      "activity_id": "97052eb9-e65e-443f-a297-f2d9a4a7f795"
    },
    "api_slug": "phone_calls",
    "singular_noun": "Phone call",
    "plural_noun": "Phone calls",
    "extends": [
      {
        "schema_id": "b1d6a29e-6f6f-4a0a-9b0e-59f0a3e3f7a1",
        "schema_slug": "calls"
      }
    ],
    "is_system_activity": true,
    "created_at": "2022-11-21T13:22:49.061281000Z"
  }
}

{
  "status_code": 403,
  "type": "auth_error",
  "code": "billing_error",
  "message": "Custom activities are not supported on your plan. Please upgrade or contact sales to gain access."
}

{
  "status_code": 409,
  "type": "invalid_request_error",
  "code": "slug_conflict",
  "message": "Failed to create activity. Please ensure your api_slug and names are unique."
}