curl --request POST \
  --url https://production.hifi.com/v3/users/{userId}/external-card-sessions \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "requestId": "8f14e45f-ceea-467e-adde-0f8d0f5f4b1c",
  "redirectUrl": "https://example.com/card-onboarding/complete",
  "recipientEmail": "jane.doe@example.com",
  "expiresIn": 3600
}
'

import requests

url = "https://production.hifi.com/v3/users/{userId}/external-card-sessions"

payload = {
    "requestId": "8f14e45f-ceea-467e-adde-0f8d0f5f4b1c",
    "redirectUrl": "https://example.com/card-onboarding/complete",
    "recipientEmail": "jane.doe@example.com",
    "expiresIn": 3600
}
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({
    requestId: '8f14e45f-ceea-467e-adde-0f8d0f5f4b1c',
    redirectUrl: 'https://example.com/card-onboarding/complete',
    recipientEmail: 'jane.doe@example.com',
    expiresIn: 3600
  })
};

fetch('https://production.hifi.com/v3/users/{userId}/external-card-sessions', 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://production.hifi.com/v3/users/{userId}/external-card-sessions",
  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([
    'requestId' => '8f14e45f-ceea-467e-adde-0f8d0f5f4b1c',
    'redirectUrl' => 'https://example.com/card-onboarding/complete',
    'recipientEmail' => 'jane.doe@example.com',
    'expiresIn' => 3600
  ]),
  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://production.hifi.com/v3/users/{userId}/external-card-sessions"

	payload := strings.NewReader("{\n  \"requestId\": \"8f14e45f-ceea-467e-adde-0f8d0f5f4b1c\",\n  \"redirectUrl\": \"https://example.com/card-onboarding/complete\",\n  \"recipientEmail\": \"jane.doe@example.com\",\n  \"expiresIn\": 3600\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://production.hifi.com/v3/users/{userId}/external-card-sessions")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"requestId\": \"8f14e45f-ceea-467e-adde-0f8d0f5f4b1c\",\n  \"redirectUrl\": \"https://example.com/card-onboarding/complete\",\n  \"recipientEmail\": \"jane.doe@example.com\",\n  \"expiresIn\": 3600\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://production.hifi.com/v3/users/{userId}/external-card-sessions")

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  \"requestId\": \"8f14e45f-ceea-467e-adde-0f8d0f5f4b1c\",\n  \"redirectUrl\": \"https://example.com/card-onboarding/complete\",\n  \"recipientEmail\": \"jane.doe@example.com\",\n  \"expiresIn\": 3600\n}"

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

{
  "id": "ecs_2mNpXwZ7bV1aLcs3Kf9dQ",
  "userId": "usr_3Kf9dQ2mNpXwZ7bV1aLcs",
  "counterPartyId": null,
  "url": "https://dashboard.hifi.com/sandbox/external-card-sessions/ecs_2mNpXwZ7bV1aLcs3Kf9dQ?userId=usr_3Kf9dQ2mNpXwZ7bV1aLcs#sessionToken=...",
  "recipientEmail": "jane.doe@example.com",
  "redirectUrl": "https://example.com/card-onboarding/complete",
  "status": "PENDING",
  "expiredAt": "2026-07-01T11:30:00.000Z",
  "createdAt": "2026-07-01T10:30:00.000Z",
  "updatedAt": "2026-07-01T10:30:00.000Z"
}

{
  "type": "VALIDATION_ERROR",
  "message": "One or more fields are invalid or missing.",
  "fields": [
    {
      "code": "invalid_value",
      "message": "Must be a valid email address",
      "field": "email"
    }
  ]
}

{
  "type": "UNAUTHORIZED",
  "message": "Authentication required"
}

{
  "type": "RESOURCE_NOT_FOUND",
  "message": "<string>",
  "fields": [
    {
      "code": "<string>",
      "message": "<string>",
      "field": "<string>"
    }
  ]
}

{
  "type": "INTERNAL_SERVER_ERROR",
  "message": "An internal server error occurred"
}