curl --request POST \
  --url https://api.dev.shadowchef.co/v1/partner/menus/modifier-groups/modifiers \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "modifierGroupID": 1549,
  "attach": [
    {
      "id": 29654,
      "sequence": 1
    }
  ]
}
'

const url = 'https://api.dev.shadowchef.co/v1/partner/menus/modifier-groups/modifiers';
const options = {
  method: 'POST',
  headers: {Authorization: 'Basic <encoded-value>', 'Content-Type': 'application/json'},
  body: JSON.stringify({modifierGroupID: 1549, attach: [{id: 29654, sequence: 1}]})
};

fetch(url, options)
  .then(res => res.json())
  .then(json => console.log(json))
  .catch(err => console.error(err));

import requests

url = "https://api.dev.shadowchef.co/v1/partner/menus/modifier-groups/modifiers"

payload = {
    "modifierGroupID": 1549,
    "attach": [
        {
            "id": 29654,
            "sequence": 1
        }
    ]
}
headers = {
    "Authorization": "Basic <encoded-value>",
    "Content-Type": "application/json"
}

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

print(response.text)

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.dev.shadowchef.co/v1/partner/menus/modifier-groups/modifiers"

	payload := strings.NewReader("{\n  \"modifierGroupID\": 1549,\n  \"attach\": [\n    {\n      \"id\": 29654,\n      \"sequence\": 1\n    }\n  ]\n}")

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

	req.Header.Add("Authorization", "Basic <encoded-value>")
	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))

}

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.dev.shadowchef.co/v1/partner/menus/modifier-groups/modifiers",
  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([
    'modifierGroupID' => 1549,
    'attach' => [
        [
                'id' => 29654,
                'sequence' => 1
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Basic <encoded-value>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

{
  "request_id": "req_4d1b7e3f-...",
  "data": "<unknown>",
  "error": {
    "code": "auth_invalid_credential",
    "message": "<string>",
    "details": "<unknown>"
  }
}

{
  "request_id": "req_4d1b7e3f-...",
  "data": "<unknown>",
  "error": {
    "code": "request_invalid",
    "message": "<string>",
    "details": "<unknown>"
  }
}