Create Setup Intent - Flex Documentation

Create Setup Intent

cURL

curl --request POST \
  --url https://api.withflex.com/v1/setup_intents \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "setup_intent": {
    "partner_id": "facct_01J9XR8M3K7VZ8N2YB4WJ6T0RA",
    "checkout_session": "fcs_01J9XR8M3K7VZ8N2YB4WJ6T0RA"
  }
}
'```

### Python

```python
import requests

url = "https://api.withflex.com/v1/setup_intents"

payload = { "setup_intent": {
        "partner_id": "facct_01J9XR8M3K7VZ8N2YB4WJ6T0RA",
        "checkout_session": "fcs_01J9XR8M3K7VZ8N2YB4WJ6T0RA"
    } }
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

JavaScript

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    setup_intent: {
      partner_id: 'facct_01J9XR8M3K7VZ8N2YB4WJ6T0RA',
      checkout_session: 'fcs_01J9XR8M3K7VZ8N2YB4WJ6T0RA'
    }
  })
};

fetch('https://api.withflex.com/v1/setup_intents', 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.withflex.com/v1/setup_intents",
  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([
    'setup_intent' => [
        'partner_id' => 'facct_01J9XR8M3K7VZ8N2YB4WJ6T0RA',
        'checkout_session' => 'fcs_01J9XR8M3K7VZ8N2YB4WJ6T0RA'
    ]
  ]),
  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;
}

Go

package main

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

func main() {

url := "https://api.withflex.com/v1/setup_intents"

payload := strings.NewReader("{\n  \"setup_intent\": {\n    \"partner_id\": \"facct_01J9XR8M3K7VZ8N2YB4WJ6T0RA\",\n    \"checkout_session\": \"fcs_01J9XR8M3K7VZ8N2YB4WJ6T0RA\"\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))
}

Error Responses

• 200: Successful response when the setup intent is created.
• 401: Unauthorized.
• 403: Forbidden.
• 404: Not found.
• 409: Conflict.
• 422: Unprocessable entity.
• 429: Too many requests.

Response Example

{
  "setup_intent": {
    "setup_intent_id": "fseti_01J9XR8M3K7VZ8N2YB4WJ6T0RA",
    "description": "Premium SPF 50 mineral sunscreen",
    "payment_method": "fpm_01J9XR8M3K7VZ8N2YB4WJ6T0RA",
    "partner_id": "facct_01J9XR8M3K7VZ8N2YB4WJ6T0RA",
    "metadata": {
      "order_id": "8842",
      "channel": "shopify"
    },
    "created_at": "2026-06-15T14:30:00Z",
    "test_mode": false,
    "status": "requires_payment_method",
    "usage": "off_session",
    "subscription_id": "fsub_01J9XR8M3K7VZ8N2YB4WJ6T0RA"
  }
}

Authorization

Authorization is a string header required to access this API.

Body

The body of the request should contain a single setup intent object:

{
  "setup_intent": {
    "partner_id": "facct_01J9XR8M3K7VZ8N2YB4WJ6T0RA",
    "checkout_session": "fcs_01J9XR8M3K7VZ8N2YB4WJ6T0RA"
  }
}

Final Notes

Ensure to replace <token> with your actual Bearer token when making requests.