Create a callback registration

curl --request POST \
  --url https://api.fluid.app/api/callback/registrations \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "callback_registration": {
    "definition_name": "update_cart_tax",
    "url": "https://tax.dundermifflin.com/fluid/callbacks/cart-tax",
    "active": true,
    "country_codes": [
      "US"
    ],
    "points_format": "whole"
  }
}
'

import requests

url = "https://api.fluid.app/api/callback/registrations"

payload = { "callback_registration": {
        "definition_name": "update_cart_tax",
        "url": "https://tax.dundermifflin.com/fluid/callbacks/cart-tax",
        "active": True,
        "country_codes": ["US"],
        "points_format": "whole"
    } }
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({
    callback_registration: {
      definition_name: 'update_cart_tax',
      url: 'https://tax.dundermifflin.com/fluid/callbacks/cart-tax',
      active: true,
      country_codes: ['US'],
      points_format: 'whole'
    }
  })
};

fetch('https://api.fluid.app/api/callback/registrations', 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.fluid.app/api/callback/registrations",
  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([
    'callback_registration' => [
        'definition_name' => 'update_cart_tax',
        'url' => 'https://tax.dundermifflin.com/fluid/callbacks/cart-tax',
        'active' => true,
        'country_codes' => [
                'US'
        ],
        'points_format' => 'whole'
    ]
  ]),
  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.fluid.app/api/callback/registrations"

	payload := strings.NewReader("{\n  \"callback_registration\": {\n    \"definition_name\": \"update_cart_tax\",\n    \"url\": \"https://tax.dundermifflin.com/fluid/callbacks/cart-tax\",\n    \"active\": true,\n    \"country_codes\": [\n      \"US\"\n    ],\n    \"points_format\": \"whole\"\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.fluid.app/api/callback/registrations")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"callback_registration\": {\n    \"definition_name\": \"update_cart_tax\",\n    \"url\": \"https://tax.dundermifflin.com/fluid/callbacks/cart-tax\",\n    \"active\": true,\n    \"country_codes\": [\n      \"US\"\n    ],\n    \"points_format\": \"whole\"\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.fluid.app/api/callback/registrations")

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  \"callback_registration\": {\n    \"definition_name\": \"update_cart_tax\",\n    \"url\": \"https://tax.dundermifflin.com/fluid/callbacks/cart-tax\",\n    \"active\": true,\n    \"country_codes\": [\n      \"US\"\n    ],\n    \"points_format\": \"whole\"\n  }\n}"

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

{
  "callback_registration": {
    "uuid": "cbr_7fk2m9qxw4hz8tnp3vbd6yjc1rls5ega",
    "definition_name": "update_cart_tax",
    "url": "https://tax.dundermifflin.com/fluid/callbacks/cart-tax",
    "active": true,
    "country_codes": [
      "US"
    ],
    "verification_token": "cvt_R8vK2mQp9sXw4Lz7NbT1yHc6FdJ3gE0a",
    "created_at": "2026-09-14T15:22:08.412Z"
  },
  "meta": {
    "request_id": "8f3c2b71-5d4e-4a9b-b6f0-1e7a9c3d2f58",
    "timestamp": "2026-09-30T14:05:12Z"
  }
}

{
  "message": "<string>"
}

{
  "message": "<string>",
  "error": "<string>"
}

{
  "error_message": "<string>",
  "errors": "<string>",
  "meta": {
    "request_id": "<string>",
    "timestamp": "2023-11-07T05:31:56Z"
  }
}

{
  "error_message": "<string>",
  "errors": "<string>",
  "meta": {
    "request_id": "<string>",
    "timestamp": "2023-11-07T05:31:56Z"
  }
}