curl --request GET \
  --url https://fit.kleep.ai/v1/products/{product_id}/sizing \
  --header 'Authorization: Bearer <token>' \
  --header 'Kleep-Retailer: <kleep-retailer>'

import requests

url = "https://fit.kleep.ai/v1/products/{product_id}/sizing"

headers = {
    "Kleep-Retailer": "<kleep-retailer>",
    "Authorization": "Bearer <token>"
}

response = requests.get(url, headers=headers)

print(response.text)

const options = {
  method: 'GET',
  headers: {'Kleep-Retailer': '<kleep-retailer>', Authorization: 'Bearer <token>'}
};

fetch('https://fit.kleep.ai/v1/products/{product_id}/sizing', 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://fit.kleep.ai/v1/products/{product_id}/sizing",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Kleep-Retailer: <kleep-retailer>"
  ],
]);

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

curl_close($curl);

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

package main

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

func main() {

	url := "https://fit.kleep.ai/v1/products/{product_id}/sizing"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("Kleep-Retailer", "<kleep-retailer>")
	req.Header.Add("Authorization", "Bearer <token>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.get("https://fit.kleep.ai/v1/products/{product_id}/sizing")
  .header("Kleep-Retailer", "<kleep-retailer>")
  .header("Authorization", "Bearer <token>")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://fit.kleep.ai/v1/products/{product_id}/sizing")

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

request = Net::HTTP::Get.new(url)
request["Kleep-Retailer"] = '<kleep-retailer>'
request["Authorization"] = 'Bearer <token>'

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

{
  "product_id": "JEAN-0142",
  "supported": true,
  "category": "clothing",
  "sizes": [
    {
      "label": "S",
      "variant_id": "JEAN-0142-S",
      "available": true
    },
    {
      "label": "M",
      "variant_id": "JEAN-0142-M",
      "available": true
    },
    {
      "label": "L",
      "variant_id": "JEAN-0142-L",
      "available": false
    }
  ],
  "product_fit": {
    "tendency": "runs_small",
    "score": -0.4,
    "summary": "This style runs slightly small: most shoppers take one size up."
  }
}

{
  "error": {
    "code": "unauthorized",
    "message": "Invalid API key"
  }
}

{
  "error": {
    "code": "retailer_not_enabled",
    "message": "Retailer 9b1f… has not enabled this partner"
  }
}

{
  "error": {
    "code": "product_not_found",
    "message": "No product JEAN-9999 for this retailer"
  }
}

{
  "error": {
    "code": "rate_limited",
    "message": "Too many requests"
  }
}