Duplicate payments - Hosted checkout

#!/usr/bin/env bash
# Create a hosted-checkout session (Live: `billing_details` field). Redirect
# the shopper to checkout_url. Same order_reference within the TTL replays
# the existing session (201) instead of creating a duplicate — safe to retry.
set -euo pipefail

CHECKOUT_BASE="${RADIUMONE_CHECKOUT_BASE:-https://checkout-sandbox.radiumone.io}"
: "${RADIUMONE_SECRET_KEY:?set RADIUMONE_SECRET_KEY to your r1sk_* secret key}"

curl -sS -X POST "$CHECKOUT_BASE/api/v1/checkout/sessions" \
  -H "Content-Type: application/json" \
  -H "X-Api-Key: $RADIUMONE_SECRET_KEY" \
  -d @request.json

#!/usr/bin/env node
// Create a hosted-checkout session (Live: `billing_details` field). Redirect
// the shopper to checkout_url. Node 18+ ESM fetch.
// Env: RADIUMONE_SECRET_KEY, RADIUMONE_CHECKOUT_BASE (optional override).
//
// Same order_reference within the TTL replays the existing session (201)
// instead of creating a duplicate — safe to retry with the same body.
import { readFileSync } from "node:fs";

const CHECKOUT_BASE = process.env.RADIUMONE_CHECKOUT_BASE || "https://checkout-sandbox.radiumone.io";
const secretKey = process.env.RADIUMONE_SECRET_KEY;
const body = JSON.parse(readFileSync(new URL("./request.json", import.meta.url)));

// Exponential backoff with jitter: attempt 1 waits ~250-500ms, doubling each
// attempt, capped at 4s -- avoids hammering the gateway in a tight retry loop.
function backoffMs(attempt) {
  const base = Math.min(250 * 2 ** (attempt - 1), 4000);
  return base + Math.random() * base;
}

async function createCheckoutSession(maxAttempts = 3) {
  for (let attempt = 1; attempt <= maxAttempts; attempt += 1) {
    let res;
    try {
      res = await fetch(`${CHECKOUT_BASE}/api/v1/checkout/sessions`, {
        method: "POST",
        headers: {
          "Content-Type": "application/json",
          "X-Api-Key": secretKey,
        },
        body: JSON.stringify(body), // same order_reference every attempt
      });
    } catch (networkErr) {
      if (attempt === maxAttempts) throw networkErr;
      await new Promise((r) => setTimeout(r, backoffMs(attempt)));
      continue;
    }

    if (res.status >= 500) {
      if (attempt === maxAttempts) throw new Error(`server error ${res.status} after ${attempt} attempts`);
      await new Promise((r) => setTimeout(r, backoffMs(attempt)));
      continue;
    }

    const payload = await res.json();
    if (!res.ok) {
      throw new Error(`checkout session create failed: ${payload.code ?? payload.type} (${res.status})`);
    }
    return payload; // redirect the shopper to payload.data.checkout_url
  }
  throw new Error("unreachable");
}

createCheckoutSession().then((r) => console.log(JSON.stringify(r, null, 2)));

#!/usr/bin/env python3
"""Create a hosted-checkout session (Live: ``billing_details`` field).
Redirect the shopper to checkout_url.

Same order_reference within the TTL replays the existing session (201)
instead of creating a duplicate — safe to retry with the same body.
"""
import json
import os
import random
import time
from pathlib import Path

import requests

CHECKOUT_BASE = os.environ.get("RADIUMONE_CHECKOUT_BASE", "https://checkout-sandbox.radiumone.io")


def backoff_seconds(attempt: int) -> float:
    """Exponential backoff with jitter: attempt 1 waits ~0.25-0.5s, doubling
    each attempt, capped at 4s -- avoids hammering the gateway in a loop."""
    base = min(0.25 * 2 ** (attempt - 1), 4.0)
    return base + random.random() * base


def create_checkout_session(max_attempts: int = 3) -> dict:
    body = json.loads((Path(__file__).parent / "request.json").read_text())
    headers = {"X-Api-Key": os.environ.get("RADIUMONE_SECRET_KEY", "")}

    for attempt in range(1, max_attempts + 1):
        try:
            resp = requests.post(f"{CHECKOUT_BASE}/api/v1/checkout/sessions", json=body, headers=headers, timeout=30)
        except requests.exceptions.Timeout:
            if attempt == max_attempts:
                raise
            time.sleep(backoff_seconds(attempt))
            continue

        if resp.status_code >= 500:
            if attempt == max_attempts:
                raise RuntimeError(f"server error {resp.status_code} after {attempt} attempts")
            time.sleep(backoff_seconds(attempt))
            continue

        payload = resp.json()
        if not resp.ok:
            code = payload.get("code") or payload.get("type")
            raise RuntimeError(f"checkout session create failed: {code} ({resp.status_code})")
        return payload  # redirect the shopper to payload["data"]["checkout_url"]

    raise RuntimeError("unreachable")


if __name__ == "__main__":
    print(json.dumps(create_checkout_session(), indent=2))