curl --request POST \
  --url https://www.closient.com/epcis/api/2.0/verification/returns \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "biz_location": "urn:epc:id:sgln:0614141.00888.0",
  "gtin": "00614524740108",
  "return_reference": "RMA-55102",
  "serial": "ABC123XYZ"
}
'

import requests

url = "https://www.closient.com/epcis/api/2.0/verification/returns"

payload = {
    "biz_location": "urn:epc:id:sgln:0614141.00888.0",
    "gtin": "00614524740108",
    "return_reference": "RMA-55102",
    "serial": "ABC123XYZ"
}
headers = {
    "X-API-Key": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-API-Key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    biz_location: 'urn:epc:id:sgln:0614141.00888.0',
    gtin: '00614524740108',
    return_reference: 'RMA-55102',
    serial: 'ABC123XYZ'
  })
};

fetch('https://www.closient.com/epcis/api/2.0/verification/returns', 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://www.closient.com/epcis/api/2.0/verification/returns",
  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([
    'biz_location' => 'urn:epc:id:sgln:0614141.00888.0',
    'gtin' => '00614524740108',
    'return_reference' => 'RMA-55102',
    'serial' => 'ABC123XYZ'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-API-Key: <api-key>"
  ],
]);

$response = curl_exec($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://www.closient.com/epcis/api/2.0/verification/returns"

	payload := strings.NewReader("{\n  \"biz_location\": \"urn:epc:id:sgln:0614141.00888.0\",\n  \"gtin\": \"00614524740108\",\n  \"return_reference\": \"RMA-55102\",\n  \"serial\": \"ABC123XYZ\"\n}")

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

	req.Header.Add("X-API-Key", "<api-key>")
	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://www.closient.com/epcis/api/2.0/verification/returns")
  .header("X-API-Key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"biz_location\": \"urn:epc:id:sgln:0614141.00888.0\",\n  \"gtin\": \"00614524740108\",\n  \"return_reference\": \"RMA-55102\",\n  \"serial\": \"ABC123XYZ\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://www.closient.com/epcis/api/2.0/verification/returns")

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

request = Net::HTTP::Post.new(url)
request["X-API-Key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"biz_location\": \"urn:epc:id:sgln:0614141.00888.0\",\n  \"gtin\": \"00614524740108\",\n  \"return_reference\": \"RMA-55102\",\n  \"serial\": \"ABC123XYZ\"\n}"

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

{
  "event_id": "urn:uuid:3f1c2d4e-5a6b-4c7d-8e9f-0a1b2c3d4e5f",
  "gtin": "00614524740108",
  "lot": "L2847",
  "returned_at": "2026-07-20T09:12:00Z",
  "sale_transaction_reference": "TXN-88213",
  "serial": "ABC123XYZ",
  "sold_at": "2026-07-15T14:32:00Z"
}

{
  "detail": "The requested resource was not found.",
  "error_code": "not_found",
  "retryable": false,
  "status": 404,
  "timestamp": "2026-03-31T12:00:00+00:00",
  "title": "Not Found",
  "type": "https://closient.com/docs/errors/not_found"
}

{
  "detail": "The requested resource was not found.",
  "error_code": "not_found",
  "retryable": false,
  "status": 404,
  "timestamp": "2026-03-31T12:00:00+00:00",
  "title": "Not Found",
  "type": "https://closient.com/docs/errors/not_found"
}

{
  "detail": "The requested resource was not found.",
  "error_code": "not_found",
  "retryable": false,
  "status": 404,
  "timestamp": "2026-03-31T12:00:00+00:00",
  "title": "Not Found",
  "type": "https://closient.com/docs/errors/not_found"
}

{
  "detail": "The requested resource was not found.",
  "error_code": "not_found",
  "retryable": false,
  "status": 404,
  "timestamp": "2026-03-31T12:00:00+00:00",
  "title": "Not Found",
  "type": "https://closient.com/docs/errors/not_found"
}

{
  "detail": "The requested resource was not found.",
  "error_code": "not_found",
  "retryable": false,
  "status": 404,
  "timestamp": "2026-03-31T12:00:00+00:00",
  "title": "Not Found",
  "type": "https://closient.com/docs/errors/not_found"
}

{
  "detail": "The requested resource was not found.",
  "error_code": "not_found",
  "retryable": false,
  "status": 404,
  "timestamp": "2026-03-31T12:00:00+00:00",
  "title": "Not Found",
  "type": "https://closient.com/docs/errors/not_found"
}

{
  "detail": "The requested resource was not found.",
  "error_code": "not_found",
  "retryable": false,
  "status": 404,
  "timestamp": "2026-03-31T12:00:00+00:00",
  "title": "Not Found",
  "type": "https://closient.com/docs/errors/not_found"
}

{
  "detail": "The requested resource was not found.",
  "error_code": "not_found",
  "retryable": false,
  "status": 404,
  "timestamp": "2026-03-31T12:00:00+00:00",
  "title": "Not Found",
  "type": "https://closient.com/docs/errors/not_found"
}

{
  "detail": "The requested resource was not found.",
  "error_code": "not_found",
  "retryable": false,
  "status": 404,
  "timestamp": "2026-03-31T12:00:00+00:00",
  "title": "Not Found",
  "type": "https://closient.com/docs/errors/not_found"
}